This part suits arms with a 65mm diameter bush, for 75mm bushes por favor use PFF3-702. This is a replacement part that in our road series application is over 60% stiffer than or Road Series material. PFF3-802GBLK 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 por favor use PFF3-802BLK.