Receivers are mounted to the trunk pans, there is no real frame in our cars. This is the same way the SLK receiver is mounted and I used re-enforcement plates in the trunk to distribute the load. You have to pull most of the interior trunk panels to be able to remove the foam molded pieces that hold the jack and air pack. I used the drain plug hole forward in each trunk as the horizontal mounting points and aligned everything from there to the back. I have already re-installed the lower plastic covers so photos will be tough. I will be inspecting my tie points this weekend checking bolt tightness after the long drive. I will do what I can to get you better photos.