Actually there are companies that make almost all of the parts for exterior of the machines. The problem is getting a good set of "guts". There is a slot machine show in Chicago twice a year that is excellent. You can buy full machines at very cheap (relativerly) prices or just about any part you need. I have a Jennings Challenger that I have been trying for a long time to get several parts. I just have not had the opportunity to go to the show.

The info on the new replacement parts is one reason to be careful of buying a machine on the internet - it may be almost 100% new.