Designed to work with the Losi Aluminum Axle Housing Upper Track Rod Mount # LOS334002 Our Losi Upgrade Diff Skid mounts to your rear axle diff and offers great protection to your pumpkin from gouges and scratches. This is a three piece unit that comes  pre-assembled ready to mount with supplied hardware.   This listing comes with the following for the Losi Rock Rey with Aluminum Upper Track Rod Mount: One TBR Diff Skid Plate - Y195 One TBR Upper Bracket - Y210 One TBR Lower Bracket - Y208