I have 2 550/500 tanks available. One is bare metal having been chemically dipped to remove all paint and crappy liners. Metal is perfect.
The other is stock, super clean interior, no rust, no leaks. The one with paint is a better buy if you are planning a custom since you can have it sanded and painted. I want a king’s ransom for the other as I spent 2 years looking for a truly perfect metal one.