BMW X Series X4 Series Front Radius Arm Bush - PFF5-2601 PFF5-2601 Front Radius Arm Bush is made using our Black 95A durometer material and supplied with outer shells to increase stiffness by up to 300%, controlling longitudinal wheel movement under braking, cornering and improving longer-term durability. Note will not fit pre-supersession part numbers 31108854993 and 31108854994 . - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!