The KCKR1017 Knightrunner RotopaX for Rear Rack are specifically designed to fit the KCKR1015 Knightrunner Rear Rack when mounted on the Element RC Knightrunner (sold separately).
If you have access to a 3D printer and would like to print your own parts, please see our MyMinifactory store where you can purchase our 3D print files:
Knight_Customs MyMiniFactory.