The HD Switch Bushing to Bearing Conversion Kit Includes EVERYTHING You Need to Rebuild Your Front Wheels. Most "High End" Machines use Wheel Bearings instead of Bushings. Here's why: Bearings Create MUCH Less Drag and Is Gentler on the Grass. Unlike Most Sellers, We Provide a COMPLETE Conversion Kit and ALL the Required Hardware. PLUS FREE HUB CAPS! The HD Switch Conversion Kit Includes Everything Shown: (4) High Quality Sealed Flange Wheel Bearings with Our Premium Grease Upgrade, (2) Hub Cap Retainer Washers, (4) Heat Treated Thrust Washers (Highly Recommended for Conversion from Bushing to Bearing), (2) New E-Clips and (2) New Hub Caps.