Another late chime in - The frame horn threads are not that strong. In the course of mounting my Shrockworks bumper, I tightened and loosened them probably half a dozen times trying to get things lined up perfect (I'm anal). In the course of doing so, I stripped out 1 side. I wasn't even torquing them that hard - those threads are really weak. My solution was to drill the hole out a smidge and put a nut on the back side - there is just enough room to slide a nut up behind there (at least on my frame horns there was). The threads are weak, so be careful.