QuadBoss 18-21 Can-Am Defender HD10 X mr Repair Kit Rear Independent Suspension Repair KitKeep your upper and lower A arm and knuckle in fighting shape with this quality repair kit. Kit contains all of the components required to rebuild the upper and lower A arm and knuckle. Needle bearing shafts are made with 52100 bearing steel that has been hardened and precision ground. Self lubricating acetal nylon bushings for better wear and performance. All metal bushings are case hardened and plated to prevent wear and corrosion. This Part Fits: