What's your thoughts in what quadracer 500 parts that if discontinued, would be hard to find? For example, Like the small rubber plug that covers the swing arm bolts nut on the left side?

You mean like '88-90 zilla third & fourth gear sets?

That's a good question. I've thought about that before, so I bought every single rubber or plastic piece I can think of. I figure metal can be painted, but it's hard to restore rubber or plastic