MC5 400 exhaust

[ZapmFlash]

I just bought a 78 MC5 400, and she's a rough one. Among the many parts missing or just plain abused and needing replaced, the exhaust has the baffles removed and the entire stinger is gone. Is the stinger replaceable? Where can I get one? Would I be further ahead to buy an after market silencer? Any suggestions/advice is appreciated.
Cheers, Zap