I hit Wade's Bus Graveyard today. Met Mr. Walter Wade, who was very nice about showing me several buses that we could pull parts from. Prices seemed fairly reasonable. He has many years of wisdom about the various models and series of buses, and can tell you which drivetrains and parts are from which year.
I'll be pulling an air tank, dash panel, and whole lot more. If you live near north Georgia, and need ANY parts for your bus, this gentleman is a terrific resource.