GTE wheel well molding fasteners?

Too many hands involved in the disassembly has resulted in not having any idea how to fasten the side mouldings around the wheel opening with those 5 holes in the molding on each wheel opening to the holes in the body around the wheel wells. I would assume a stainless steel screw through the hole in the aluminum molding. But, into what? There are just the holes in the body. Some sort of barrel insert? Is there room for a backing nut (not near car at the moment to look) inside the fender well wheel openings?

Sorry for the rookie question.

At the car and boy was that a dumb question. A big nevermind on this one. :blush: