This part suits arms with a 65mm diameter bush, for 75mm bushes please use PFF3-702. This is a replacement part that in our road series application is over 100% stiffer than the original rubber bush to withstand increased loading seen by this position on the car. PFF3-802G provides +/- 0.5 caster offset that can be adjusted on the car 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 please use PFF3-802.