Here's some pics from my S1 reverse lights install today that I just got from Offroad Alliance... The S1 mounts attach in factory holes. No drilling required. Threaded clips come with kit that you slip over factory holes. No nut needed on the back of the bolts that go in these. I used use a screw driver to pop the clips on. Make sure you put the threaded clips on correctly. The flush side goes on the side that the light attaches to. I used one of the split washers that came with the kit on each of the mount bolts. 1/4 socket with 3mm metric hex to snug up lights. Leaving the bolt that attaches the light mount to the body a little lose makes this easier because you can swivel the light to tighten the screws that hold the light to the mount. 7/16 open end wrench tightens mount down. Note the logo on the lights is upside down. If this bugs you, you can remove the lens bracket and reverse it.