aNY HARDWARE STORE
ack(stupid capslock)
Ive got a pretty standard door that had 4 square holes(1/4"), 1 on each side of the coindoor frame. The wood that is surrounding it was 3/4" same as the rest of my cab.
So I got some carriage bolts that were 1/4" in diameter(of the square part) and 1"(i think, maybe 1-1/4") On the inside I used some rubber washers and really cranked it down with regular 1/4" nuts
Eventually I found some store that carried the size I needed in black- previously I just had silver and never bothered to paint them