I've done some major rustwork on my car lately. I disassembled fuel tank, rear/mid exhaust, front struts, trailer hitch, covers, front/rear bumper etc. Inside i took out everything from the rear seats and back. I found these two 18 nuts in the area i was working. Everything is put back together, but i can't find any place for the nuts. Last summer I disassembled a subframe/engine/gearbox that i bought in the garage, so they might just be laying around since then, but im not sure. Anyone recognize the nuts?