Control Arm Lower Complete Alloy Assembly - DuroBall: Race and Competition. 1.5 to 2 Degrees Positive Caster Change per Side. Up to 0.5 Degrees Negative Camber Change. SuperPro Alloy Control Arm Assemblies deliver more caster and eliminate unwanted flex. This arm kit has an aggressive caster change that can cause the tyre to guard contact where the wheels are running a greater offset than standard. Manufactured with a higher Duro bushing, this kit is ideally suited to Race vehicles. For Audi A3 Mk3. Seat Leon, Skoda Octavia and VW Golf.