Where exactly is the rear lower control arm knuckle bushing located on these BMW platforms?

This bushing sits at the connection point between the rear lower control arm (the lower wishbone arm at the bottom of the rear suspension) and the rear knuckle (the upright that holds the wheel bearing and hub). It is a separate location from the trailing arm bushings at the front of the rear suspension and the upper arm bushings at the rear knuckle's top connection. If you are rebuilding the full rear suspension with spherical bearings, this is one of the four or five distinct bushing locations that need to be addressed for a complete conversion.

Why does SPL use the largest possible FK bearing in this location rather than a smaller one?

A larger bearing distributes the same load across a greater contact area, which reduces the stress per unit of surface area on both the bearing and the housing. Lower specific loading means slower wear, better longevity, and a bearing that operates at cooler temperatures under sustained use. A smaller bearing pushing the same load through a tighter geometry wears faster and can introduce more NVH over time. SPL specifically calls out the bearing sizing decision because it reflects a deliberate engineering choice about long-term performance rather than a minimum-spec design.

Is this bushing noticeably different in NVH from the factory rubber?

SPL designs this bushing to produce lower NVH than would be expected from a spherical bearing replacement at this location, specifically because of the larger FK bearing choice. A larger bearing operates with less friction and at lower specific loads, which produces less transmitted vibration than a smaller bearing. The Teflon liner also contributes to smooth, quiet articulation. While any spherical bearing will transmit slightly more road noise than soft rubber, the larger bearing spec at this location keeps that increase minimal compared to what a smaller bearing would produce.

What OEM BMW part numbers does the SPL RLCB E9X replace?

This bushing replaces BMW OEM part numbers 33326775552 and 33326756249. These are the part numbers for the factory rubber lower control arm knuckle bushing used across the listed E8X, E9X, F2X, F3X, F8X, and G8X BMW platforms.

Should this bushing be replaced at the same time as other rear suspension bushings?

Yes, and this is the approach recommended by shops that build performance BMWs. Replacing the trailing arm bushings, upper arm bushings, and knuckle bushings while leaving this location in factory rubber leaves a deflection point that partially offsets the precision gains from the other components. A complete rear spherical bushing conversion addresses all bushing positions simultaneously; this lower control arm knuckle bushing is one of the pieces that should be included in that process.

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BP PRICING DIFFERENCE

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Description

SPL Parts Rear Lower Control Arm Knuckle Bushing for E8x / E9x / F2x / F3x / F8x BMW 1, 2 ,3, 4 Series & M2, M3, and M4

Most BMW rear suspension bushing conversations focus on the trailing arm bushings and the knuckle bushings at the upper arm. The lower control arm knuckle bushing; the rubber interface between the rear lower control arm and the rear knuckle itself; gets less attention and carries significant consequences when it deflects. Under hard cornering, acceleration, and braking, the factory rubber at this location allows the arm to move relative to the knuckle, changing the rear geometry in ways that are subtle but consistent enough to reduce rear suspension precision and increase tire wear on builds that see serious performance use. SPL Parts addresses this with a purpose-built spherical bearing replacement that is specifically sized to use the largest FK bearing the location can physically accommodate. The decision to use the largest possible bearing rather than a minimally sufficient one is deliberate; a larger bearing has a greater contact area, lower specific loading, and longer service life, which means better longevity and lower NVH compared to a smaller bearing pushing the same load through a tighter geometry. The FK bearing uses a Teflon liner for low-friction, self-lubricating articulation through the full suspension range without binding.

Features

Replaces factory rubber rear lower control arm knuckle bushing with a Teflon-lined FK spherical bearing; eliminates deflection under heavy cornering, braking, and acceleration loads
Largest possible FK bearing used in this location; maximizes contact area, reduces specific loading, improves longevity and lowers NVH compared to a smaller bearing at the same load
CNC-machined 6061-T6 aluminum bearing housing; machined to +/- .001-inch tolerance for accurate fitment and dimensional stability under sustained load and thermal cycling
Reduces bind as the lower control arm travels through suspension range of motion; free articulation through the full suspension arc without the stick-slip behavior rubber exhibits
Replaces BMW part numbers 33326775552 and 33326756249

Specifications

Material: CNC-machined billet aluminum or PTFE-lined spherical bearing (per part)
Replaces: OEM rubber bushing
Adjustment: None (solid replacement)
Origin: Made in the USA

Applications

BMW 116d: F20, F21 | 2012-2019
BMW 118d: E81, E87, F20, F21 | 2004-2019
BMW 120d: E81, E87, F20, F21 | 2004-2019
BMW 123d: E81, E87 | 2007-2013
BMW 125d: F20, F21 | 2012-2019
BMW 128ti: F20, F21 | 2019-2019
BMW 116i: E81, E87, F20, F21 | 2004-2019
BMW 118i: E81, E87, F20, F21 | 2004-2019
BMW 120i: E81, E87, F20, F21 | 2004-2019
BMW 125i: E81, E87, F20, F21 | 2007-2019
BMW 128i: E82, E88 | 2007-2013
BMW 130i: E81, E87 | 2004-2013
BMW 135i: E82, E88, F20, F21 | 2007-2016
BMW 1M Coupé: E82 | 2011-2012
BMW 220d: F22, F23 | 2014-2021
BMW 225d: F22, F23 | 2014-2021
BMW 220i: F22, F23 | 2014-2021
BMW 228i: F22, F23 | 2014-2016
BMW 230i: F22, F23 | 2016-2021
BMW 240i: F22, F23 | 2016-2021
BMW 316d: F30, F31 | 2012-2019
BMW 318d: F30, F31 | 2012-2019
BMW 320d: F30, F31 | 2012-2019
BMW 325d: F30, F31 | 2012-2019
BMW 330d: F30, F31 | 2012-2019
BMW 335d: F30, F31 | 2012-2019
BMW 330e: F30, F31 | 2015-2019
BMW 316i: F30, F31 | 2012-2019
BMW 318i: F30, F31 | 2012-2019
BMW 320i: F30, F31 | 2012-2019
BMW 328i: F30, F31 | 2012-2016
BMW 330i: F30, F31 | 2016-2019
BMW 335i: F30, F31 | 2012-2015
BMW 340i: F30, F31 | 2015-2019
BMW 420d: F32, F33, F36 | 2014-2020
BMW 425d: F32, F33, F36 | 2014-2020
BMW 430d: F32, F33, F36 | 2014-2020
BMW 435d: F32, F33, F36 | 2014-2020
BMW 420i: F32, F33, F36 | 2014-2020
BMW 428i: F32, F33, F36 | 2014-2016
BMW 430i: F32, F33, F36 | 2016-2020
BMW 435i: F32, F33, F36 | 2014-2016
BMW 440i: F32, F33, F36 | 2016-2020
BMW M135i: F20, F21 | 2012-2016
BMW M140i: F20, F21 | 2016-2019
BMW M235i: F22, F23 | 2014-2016
BMW M240i: F22, F23 | 2016-2021
BMW M340i: F30, F31 | 2019-2019
BMW M2: F87, G87 | 2016-present
BMW M3: F80, G80, G81 | 2014-present
BMW M4: F82, F83, G82, G83 | 2014-present

Notes

SPL components are made-to-order in the USA; build time will be confirmed at the time of order.

Frequently Asked Questions

Where exactly is the rear lower control arm knuckle bushing located on these BMW platforms? This bushing sits at the connection point between the rear lower control arm (the lower wishbone arm at the bottom of the rear suspension) and the rear knuckle (the upright that holds the wheel bearing and hub). It is a separate location from the trailing arm bushings at the front of the rear suspension and the upper arm bushings at the rear knuckle’s top connection. If you are rebuilding the full rear suspension with spherical bearings, this is one of the four or five distinct bushing locations that need to be addressed for a complete conversion.
Why does SPL use the largest possible FK bearing in this location rather than a smaller one? A larger bearing distributes the same load across a greater contact area, which reduces the stress per unit of surface area on both the bearing and the housing. Lower specific loading means slower wear, better longevity, and a bearing that operates at cooler temperatures under sustained use. A smaller bearing pushing the same load through a tighter geometry wears faster and can introduce more NVH over time. SPL specifically calls out the bearing sizing decision because it reflects a deliberate engineering choice about long-term performance rather than a minimum-spec design.
Is this bushing noticeably different in NVH from the factory rubber? SPL designs this bushing to produce lower NVH than would be expected from a spherical bearing replacement at this location, specifically because of the larger FK bearing choice. A larger bearing operates with less friction and at lower specific loads, which produces less transmitted vibration than a smaller bearing. The Teflon liner also contributes to smooth, quiet articulation. While any spherical bearing will transmit slightly more road noise than soft rubber, the larger bearing spec at this location keeps that increase minimal compared to what a smaller bearing would produce.
What OEM BMW part numbers does the SPL RLCB E9X replace? This bushing replaces BMW OEM part numbers 33326775552 and 33326756249. These are the part numbers for the factory rubber lower control arm knuckle bushing used across the listed E8x, E9x, F2x, F3x, F8x, and G8x BMW platforms.
Should this bushing be replaced at the same time as other rear suspension bushings? Yes, and this is the approach recommended by shops that build performance BMWs. Replacing the trailing arm bushings, upper arm bushings, and knuckle bushings while leaving this location in factory rubber leaves a deflection point that partially offsets the precision gains from the other components. A complete rear spherical bushing conversion addresses all bushing positions simultaneously; this lower control arm knuckle bushing is one of the pieces that should be included in that process.

About SPL Parts

SPL Parts is a USA-based manufacturer of high-performance suspension components engineered for both professional racing and demanding street applications. Built on the core principles of strength, lightweight construction, low friction, and precision, SPL Parts products deliver the adjustability and alignment performance required by top race teams and discerning enthusiasts alike. Every component is produced using USA-sourced, certified materials and machined by experienced local shops to exacting tolerances. Professional TIG welders ensure maximum weld integrity, while each part is hand-fitted and treated with anti-seize and 3M internal panel coating for lasting protection. SPL Parts conducts all research and development in-house, allowing the team to leverage firsthand product knowledge and deliver unmatched customer support. Their suspension components feature innovative adjuster designs for quicker, more precise alignments, and utilize spherical bearings with Teflon liners that are self-cleaning, self-lubricating, and built for long service life. From concept to assembly, SPL Parts is made with pride in the USA by skilled machinists and welders who are committed to quality, innovation, and performance.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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SPL Parts Rear Lower Control Arm Knuckle Bushing for E8x / E9x / F2x / F3x / F8x BMW 1, 2 ,3, 4 Series & M2, M3, and M4 [SPLRLCBE9X]

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SPL Parts Rear Lower Control Arm Knuckle Bushing for E8x / E9x / F2x / F3x / F8x BMW 1, 2 ,3, 4 Series & M2, M3, and M4

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

Reviews