We're talking about that triangular shaped area where the arch meets the rear corner. On the corner, there's supposed to be two small little alignment pins, and one hole in the center. On the rear arch, there's supposed to be three holes(two for the alignment pins, one for the bolt in the middle). The clip nut goes on the arch, and the 6mm bolt goes up through the corner into the arch/clip nut. The only time I've ever put the rear corners on, I've pulled the wheel arch, installed the corner, then put the wheel arch back on.