Linkage Bearing Kit. The All Balls Linkage Bearing Kit contains all of the bearings - including the lower shock bearing kit - needed to repair or refurbish your swingarm shock linkage. Contains everything required to rebuild swing arm linkage to factory specifications. The kit features: 52100 Bearing Steel - Through hardened and precision ground. Needle Bearings - 52100 bearing steel ARC61-65 heat treated ST13 steel shell. Bushings - Case hardened and plated to prevent wear and corrosion. Lower Shock Bearing Kit Included - All Balls linkage kits include the lower shock bearing kits. The most complete kit in the industry. Note: Image is for display purposes only; kit contents may vary by fitment and are subject to change. Kit Includes: