Please give more details regarding how to replace the Tribute (2003) fog lights. I've seen some posts on this. However, I can't seem to remove any of the fasteners (plastic screw-like things in the wheel well) or metal bolts (along the lower part of the front bumper cover). The fasteners just turn and won't back out - I've successfully removed these elsewhere where I had access to the back side; such is not the case here. The bolts turn slightly but don't seem to be backing out. I don't think the threads are stripped. Any detailed hints anyone could give would be most appreciated.

Thanks.