Dorman 526-578 rear right upper lateral arm for the 2021-2025 Audi A5 and other vehicles helps locate the rear wheel in the suspension. It is a direct replacement in the Dorman OE Solutions line that has been rigorously tested by product and quality engineers.
Worn bushings or a bent arm can show up as clunks over bumps, uneven rear tire wear or loose handling, and other suspension parts can produce these too, so find the cause before replacing the arm. With the engine off, a visible crack, bend or split bushing rubber is the first thing to look for. This listing is one arm; the left side is a separate part, and both sides are normally replaced together.
The 2021-2025 Audi A5, the 2021-2025 Audi RS5 and the 2021-2025 Audi RS5 Sportback all take this arm, as do other Audi models.
Fit and size
Build and materials
One lateral arm with its bushings. This listing is one arm for the rear right position, and that position takes one. Mounting hardware is not included, so plan on new bolts, since the old ones may not be reusable.
Interchange: TC4812 · 8W0505398C · 8W0505398E · 8W0505398F
This part cross-references / interchanges with the following part numbers:
Does Dorman 526-578 fit the 2021-2025 Audi RS5?
Yes, Dorman 526-578 is listed for the rear right upper position on the 2021-2025 Audi RS5. If your Audi is not named here, look up your car on the Buyer's Guide tab.
Does this rear right lateral arm come with bushings?
Yes, bushings are included with this lateral arm, one at each end. Mounting hardware is not included.
What is the Dorman 526-578 lateral arm made of?
The Dorman 526-578 arm is steel with rubber bushings. It is a bent, boxed design 405.5 mm long.
Can a worn rear lateral arm cause clunking over bumps?
It can. Worn bushings or a bent arm may cause clunks over bumps, uneven rear tire wear or loose handling, but worn parts elsewhere in the rear suspension can produce them too.
Is Dorman 526-578 a replacement for part number 8W0505398C?
Yes, 8W0505398C is on the interchange list for Dorman 526-578, a rear right upper lateral arm.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
