Due to the design of the front suspension on the E46 3 Series and E85/6 Z4, the control or caster arm bushings take a lot of abuse, and as a result they have a relatively short service life. If the bushes aren't replaced on time, they can put undue stress on the ball-joint within the control arm, making it a bigger job down the track. This replacement bushing kit from Febi-Bilstein is designed to match the original bushes in terms of ride and handling, as well as build quality. This set of two has been pre-pressed into new aluminium brackets and comes with all four bolts for easy installation.