I was tinkering with the standard 65 seatbelts I bought from a salvage yard and after engineering mounts for the back seat, I was checking out the mounts for the fronts. The passenger side outer mounting nut is missing! I found the hole but there is no nut on the inside. Drivers side is fine, bolted in the seatbelt with ease. How the heck do I bolt in the seatbelt on the passenger side now? Anyone ever have to do this?