So for life of me could understand the directions and how that would work. Then noticed it says for f150 2015-2020. I found an easy work around. First attach the back piece and put it over my tie down. After that attached the back with the front piece on. Put a level on it and marked the holes with a sharpie. Drilled the holes and used self tapping screws (included) and all works great. Now on the piece itself. I like it but it seems to be the kind of plastic that in cold weather will break. I don’t know that for sure but most will know the kind of plastic I am referring to. It does swing out plenty far to get anything you need. So in all time will tell on its stability. Right now would recommend.