Re: BENDIX TU-FLO 501 Compressor Rebuild CSI
I agree, just buy a new or rebuilt pump. Much easier and faster to do, and you will be assured the pump has been rebuilt properly and will last a long time. You are making the issue harder than it has to be by trying to rebuild it. You should be able to find what you need from a little searching on the net.
Same for the exhaust, it's much cheaper to replace the pump and exhaust than to buy another bus and start over with something you don't know the history on. JMHO.