Adjust front camber and caster +-1.5deg on the Audi C8 platform with these forged aluminum adjustable control arms from SPC. OE style booted ball joints adn bonded rubber bushings maintain factory ride, handling and noise, vibration, & harshness (NVH) parameters. Audi's unique multi-link suspension creates a 'Virtual' SAI. The factory does not publish a specification for caster, but SPC recommends 5deg to 6deg of caster as a preferred angle for tracking and return to center on these cars. This kit includes four arms to replace both upper links on both sides of the vehicle. For the left hand (LH) side, use #81391. For the right hand (RH) side, use part number #81392. SPC Arms Feature: Forged 6061-T6 Aluminum contruction for maximized strength at a minimum weightOE style, maintenance free, booted ball joints Large 18mm threaded adjuster linksReplacement pinch bolts included Need to replace the ball joint boots on these arms? We have replacement kits available! Part No. 81354. California Residents WARNING