I countersunk flat head stainless steel bolts and used washers and keps nuts on the inside. I used 10-32 hardware. I also used urethane as a sealant between the guard and the body. I'm not sure I would use that again as it was a royal mess. Reaching the nuts was a pain too, but the end result is a pretty nice setup. Oh, I installed mine on a '98 and did some alterations to the panels. First, I added a little metal at the top of the tailights where the '96- bodys had hatch. Then I added a strip along the lower edge to cover my cut lower rear body area. I welded, ground, and sanded the seams and you can't even tell it was done. Jeff