SPL Parts Toyota A90/Z4 Front Swaybar EndlinksSPL Parts Toyota A90 Z4 Front Swaybar Endlinks Rubber should be saved for the tires. The factory swaybar endlinks on the Toyota GR Supra A90 and BMW Z4 G29 use soft rubber bushings that flex under load, which lets alignment and toe change right when you are asking the car to work the hardest. SPL Parts replaces those links with fully adjustable, spherical bearing components that keep the suspension honest and repeatable on both street and track.