Powerflex Front Radius Arm to Chassis Bush Caster Offset PFF5-6201GThis is a replacement part that uses our Black Series material to boost stiffness over the original part by 18% to withstand increased loading seen by this position on the car. PFF5 6201G provides a fixed 6mm offset to provide + 0. 5 caster offset for improved steering feel. Additional caster will also create additional negative camber on turn giving improved tyre contact with the road under heavy cornering. For a non adjustable version of this bush