I second Pinball Resource. Send them an email with the pics and they might be able to help you. Pinball shows are a great source for things like this. There is always a guy with a box of junk metal or scrap playfields. It doesn't have to be the right game, just the same era. Also, you need a rivet press, not a rivet gun. Very different. Maybe someone local to you has a rivet press you can use.