Add on kit for to turn Prime Wheeljack mold into Hot Rod. The pipes and spoiler are on ball joints to make them integrated with the transformation. The pipes are held on using clips that slide on the lip at the bottom of the door/arm. The ball joint for the pipes can be a little loose but will hold in place without a problem. The spoiler plugs into the location of the current, smaller stock spoiler. It is tight without the placement of screws but the mount has holes to allow the reuses the stock screws that are used with the stock spoiler. These parts have been tested using WSF. Thanks for looking and enjoy.