Buy OEM Audi Part # 4H0407254M (4H0-407-254-M, 4H0407254G). Steering Knuckle. A8, S8; Right. Steering Knuckle - Repair or Replace The steering knuckle in your Audi may need to be

Housing. Steering knuckle.
A knuckle used on a Steering axle that has no additional components attached.

Steering Knuckle

Fits A8, S8

A8, S8; Right.
Steering Knuckle - Repair or Replace
The steering knuckle in your Audi may need to be replaced if it has become damaged or rusty, which will usually be determined during a related repair.