My TDR is as hard to get parts for and I don't bother with the others now. Fowlers, sometimes I will step outside the box or pistons and the like but its reluctantly and normally causes hassle. As for exhausts, best of luck, consider having one made, esp if looking at new yam exhaust as the cost of a custom replica may well be comparable and you could spec it with better can internals and stainless construction. bodywork, if yours are repairable then go for it. There are people that can strike moulds from the originals, there is one on the TDR forum. If you like I can ask. May take a day or two for a reply.