Ok, so I'm new to this forum and a very recent shortbus purchaser. 1988 Wayne Chevy G30 van conversion. Here's the question. The screws holding the aluminum window frames in are pretty rusted and looking not so nice. I removed one and took it to the local mecca of all things screw related - McFeelys. Unfortunately they didn't have one that matched. It appears to be a #12 x 3/4" sheet metal screw with very fine threads and truss head. Anyone have any resources for these in aluminum or ss? I can find them about the right size with the truss head but they appear to have coarser threads. I guess it would be fine to substitute the new ones with coarse threads? Thanks.