Yea the rear bolts don’t really have much threads, front bolts go all the way through the nut though. The more you install/remove these skids the more they shape to the contour of the LCAs. You definitely have to put a sizeable notch in them to avoid contact with the frame, it took a few tries before mine totally clear.
I don’t have a pic of them installed but here is a pic of the notches I made.