Quality made in the USA HEAVY DUTY ****USED ON FLEET CARS**** LAST LONGER THAN ALL OTHER BUSHINGS OUR SUPREME LINE Prothane crafts their strut arm bushings out of polyurethane, a much more durable material that will both outperform and outlast the old rubber Where the radius arm is attached to the frame, a radius arm bushing is used to dampen suspension vibrations that would otherwise pass to the frame. BST Pair BSSP Front Upper Control Arm For 2-4 Lift Kit Ford F150 Bronco Suspension Bushing Front Suspension Radius Arm Bushing Kit For Bronco Ranger Fleet Grade Radius Arm Bushing Pair Mazda - B2300, B3000, B4000, Navajo Heavy Duty Fleet Addition Front Suspension Radius Arm Bushing Kit (pair) For Bronco Ranger FORD F150 F250 F350 Explorer, Mazda B2300 B3000 B4000 Navajo Also Fits: Ford Bronco II , F250 HD, Ranger. Damaged or worn out radius arm bushings may cause changes in alignment, wandering steering, clunking from the front end of the vehicle over bumps or braking, and cupping wear on your tires.