[Gromit]

When I removed my trim soon after purchasing my 1970 C10 Custom 10, I found the entire back of the trim next to the body and paint had packed itself with mud; which I assume had been dust forced in by the wind turbulence while driving and accumulated and then turned to an adobe brick like substance.

I thought this unsatisfactory but I needed time to research and scheme so I carefully removed all the original trim with nylon trim removers and then bought at set of #10-24 aluminum nutsert rivets and a cheap riveter from Harbor Freight and installed those nutserts in the trim holes in the body sheet metal ; and then bought a like number of button head 10-24 stainless steel allen head bolts with stainless steel washers and nylock nuts - (I also had some nylon washers that I layered underneath the SS washers to keep from marring the paint) probably best to buy about 100 of each to fill all your trim holes.

The overall effect doesn't look too freakishly bad IMO - the button head allen bolts plug the trim holes in your sheet metal and it will seal everything up against dirt and water while you decide what to do about fastening the trim.

I decided to just leave the allen bolts in place because most good women will not mind and will still date a guy who drives a truck with button head allen bolts in the holes where his aluminum trim snap-in plastic fasteners and trim would normally go.