Why are both the wishbone and guide link replaced in this kit rather than just the camber arm?

The rear upper suspension on the E9X and E8X uses two arms at the top of the rear knuckle; the wishbone controls camber and the guide link controls the longitudinal position of the wheel. Replacing only the wishbone leaves the guide link in its original spot-welded sheet metal construction, which continues to flex under load. Both arms need to match in structural quality for the rear geometry to behave consistently under performance loads. The SPL RUA E9X replaces both simultaneously, bringing the full upper rear suspension up to the same standard.

Should I change the arm length when installing the SPL RUA E9X?

SPL Parts recommends keeping these arms at OEM length. The primary benefit of this kit is replacing spot-welded sheet metal with rigid aluminum construction and eliminating rubber bushing deflection; not changing the arm geometry from factory spec. Rear camber is adjusted through the wishbone arm's rotating clamp system, not through arm length changes.

Does this kit fit both M and non-M E9X and E8X variants?

Yes. The SPL RUA E9X fits both M and non-M variants of the E8X and E9X under one part number, including the 128i, 135i, 1M, 328i, 335i, and M3.

How does the rotating clamp system work for camber adjustment?

The 360-degree rotating clamp locks the wishbone arm at its set camber position when tightened with a single allen key. No jam nuts and no second tool are required. The clamp locks both the bearing orientation and the set position simultaneously in one step, making trackside adjustment faster and more repeatable than conventional adjustable arms.

Are replacement rod ends available if one wears out?

Yes. SPL Parts offers replacement rod ends for the RUA E9X in both left and right hand thread. Contact SPL Parts directly or use the links on the SPL Parts product page for the correct replacement.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

SPL Parts Adjustable Rear Upper Arm Links for E8x / E9x BMW 1 Series / 3 Series

The SPL Parts RUA E9X addresses both arms in the rear upper suspension simultaneously. The kit includes the rear wishbone (camber arm) and the rear guide link (traction arm); four arms total for one car; all built from gun-drilled 2024 aluminum links that are black anodized for corrosion resistance. Gun-drilling removes interior material weight without reducing structural rigidity, and the aluminum construction is a substantial step above the spot-welded sheet metal it replaces. Tapered stainless steel knuckle mount spacers are included for precise fitment at the rear knuckle connection. Camber adjustment is handled through the wishbone arm using SPL’s 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws; a single 3/16-inch allen key locks the setting without jam nuts or a second tool.

Features

Complete rear upper arm kit; includes both the rear wishbone (camber arm) and rear guide link (traction arm); four arms per car
Replaces spot-welded sheet metal factory non-M upper arms with rigid gun-drilled 2024 aluminum construction; eliminates structural flex under performance loads
Tapered stainless steel knuckle mount spacers for precise fitment at the rear knuckle connection
SPL exclusive 360-degree rotating clamp with 6061-T6 aluminum clamp body and blue anodized titanium socket head cap screws; locks camber setting without jam nuts
Three-piece FK spherical rod ends manufactured in Connecticut; self-lubricating, self-cleaning Teflon liner chemically bonded to inner race; zero bushing deflection under load
Teflon liner operating temperature range: -65°F to 325°F; reliable for sustained street and track use without maintenance

Specifications

Body Material: 2024-T351 aluminum (gun-drilled, black anodized)
Bushings: PTFE-lined FK USA spherical bearings
Adjustment: Camber, track width
Origin: Made in the USA

Applications

BMW 118d: E81, E82, E87, E88 | 2004-2013
BMW 120d: E81, E82, E87, E88 | 2004-2013
BMW 123d: E81, E82, E87, E88 | 2007-2013
BMW 116i: E81, E82, E87, E88 | 2004-2013
BMW 118i: E81, E82, E87, E88 | 2004-2013
BMW 120i: E81, E82, E87, E88 | 2004-2013
BMW 125i: E81, E82, E87, E88 | 2007-2013
BMW 128i: E81, E82, E87, E88 | 2007-2013
BMW 130i: E81, E82, E87, E88 | 2004-2013
BMW 135i: E81, E82, E87, E88 | 2007-2013
BMW 1M: E82 | 2011-2012
BMW 318d: E90, E91, E92, E93 | 2005-2013
BMW 320d: E90, E91, E92, E93 | 2005-2013
BMW 325d: E90, E91, E92, E93 | 2005-2013
BMW 330d: E90, E91, E92, E93 | 2005-2013
BMW 335d: E90, E91, E92, E93 | 2006-2013
BMW 316i: E90, E91, E92, E93 | 2005-2013
BMW 318i: E90, E91, E92, E93 | 2005-2013
BMW 320i: E90, E91, E92, E93 | 2005-2013
BMW 323i: E90, E91, E92, E93 | 2005-2011
BMW 325i: E90, E91, E92, E93 | 2005-2013
BMW 328i: E90, E91, E92, E93 | 2005-2013
BMW 330i: E90, E91, E92, E93 | 2005-2013
BMW 335i: E90, E91, E92, E93 | 2006-2013
BMW M3: E90, E92, E93 | 2007-2013

Notes

Installation Instructions
Replacement rod ends available from SPL Parts in left and right hand thread, please contact us
SPL components are made-to-order in the USA; build time will be confirmed at the time of order

Frequently Asked Questions

Why are both the wishbone and guide link replaced in this kit rather than just the camber arm? The rear upper suspension on the E9x and E8x uses two arms at the top of the rear knuckle; the wishbone controls camber and the guide link controls the longitudinal position of the wheel. Replacing only the wishbone leaves the guide link in its original spot-welded sheet metal construction, which continues to flex under load. Both arms need to match in structural quality for the rear geometry to behave consistently under performance loads. The SPL RUA E9X replaces both simultaneously, bringing the full upper rear suspension up to the same standard.
Should I change the arm length when installing the SPL RUA E9X? SPL Parts recommends keeping these arms at OEM length. The primary benefit of this kit is replacing spot-welded sheet metal with rigid aluminum construction and eliminating rubber bushing deflection; not changing the arm geometry from factory spec. Rear camber is adjusted through the wishbone arm’s rotating clamp system, not through arm length changes.
Does this kit fit both M and non-M E9x and E8x variants? Yes. The SPL RUA E9X fits both M and non-M variants of the E8X and E9X under one part number, including the 128i, 135i, 1M, 328i, 335i, and M3.
How does the rotating clamp system work for camber adjustment? The 360-degree rotating clamp locks the wishbone arm at its set camber position when tightened with a single allen key. No jam nuts and no second tool are required. The clamp locks both the bearing orientation and the set position simultaneously in one step, making trackside adjustment faster and more repeatable than conventional adjustable arms.
Are replacement rod ends available if one wears out? Yes. SPL Parts offers replacement rod ends for the RUA E9X in both left and right hand thread. Contact SPL Parts directly or use the links on the SPL Parts product page for the correct replacement.

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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Product Inquiry

First Name (*required)

Last Name (*required)

Your E-Mail (*required)

Telephone Number (*required)

Country (*required)

Vehicle Year / Make / Model (*required)

Please Explain What do you want to do with your vehicle

Additional Information (optional)

I agree to the terms & conditions and privacy policy and to have Bulletproof Automotive LLC contact me for promotion, marketing and other purposes via email, phone or SMS message.

SPL Parts Adjustable Rear Upper Arm Links for E8x / E9x BMW 1 Series / 3 Series [SPLRUAE9X]

Guaranteed Safe Checkout

SPL Parts Adjustable Rear Upper Arm Links for E8x / E9x BMW 1 Series / 3 Series

Features

Specifications

Applications

Notes

Frequently Asked Questions

About SPL Parts

Reviews