Screw Kits?

I purchased my 71 Demon basically in a pile, the car had been disassembled and left for dead, many, actually most, screws, interior and exterior, are missing from the puzzle. I Figure the best way to get what I need for reassembly is to get complete screw kits. I found Mr G online and figured I’d order from him, but he doesn’t list a kit for a Demon, Dusters and Darts yes, but no Demon, so I emailed him and he said he doesn’t list a kit for a Demon, said to pick something close and when I get it and something isn’t in it, let him know and he would send it, so I’m thinking a Duster should be about the same, but I don’t really know, should I order for a Duster or look elsewhere?