Note: This product is designed to work with the Losi Aluminum Housing Upper Track Rod Mount #LOS334002 Our XV4 Rear Bumper Losi Upgrade mounts to your rear axle diff at three locations. A brace connects to the bumper and at the Aluminum Housing Upper Track Rod Mount. This is a four piece unit that comes pre-assembled ready to mount with supplied mounting hardware). This listing comes with the following for Losi Rock Rey: One TBR XV4 Rear Bumper -M005 One TBR XV4 Rear Brace - Y209 One TBR C.1 upper Rod - Y132 One TBR B.1 lower Rod - Y134 One TBR Diff Skid - Y195 One TBR Lower Bracket - Y208