The rear mount bolts through a vertical hole already in the bodywork, where the rear trailing arm mounts to the body. Also the point you'd jack the body up with a hydraulic jack.
The front mounts to the heavy gauge metal box section at the rear lower edge of the front wheel arch. You need to make up a thick plate with threads to bolt into, that will slide into that box section. The bracket for the side bar can then clamp to that part of the bodywork.
Sorry, no pictures. Haven't figured out how to get them on here???