Xray have release their new Horizontal Body Post Mounting Gauge (Part Number 301349). The gauge is a specialized tool designed for X4 that helps to mark the horizontal rear body mounts position on the body shell for a perfect fit on the car. It features two special scales to check and adjust the proper position of the body. The first scale is used to adjust the rear part of the body and the second scale is used to check the body height around the car. Fits all popular body shells....
Source: Team Xray