Mechs are a standard size so any mechs should do (Hint: I have a listing on this board for token mechs w/ tokens, and so a few other people). Your coin door should have microswitches aready under where the coin mechs fit in. All the coin mech does is determine if a coin matches a certain size and weight. If it does, it drops through one part of the coin mech, tripping a switch there. If it doesn't match, it drops through another section to fall into the return tray. If you have access to a digital camera and can take a picture of your coin door, I can see if you've got all the necessary parts.