1.I've just had a flick through a few books and the early racing 851/888's had the rear exhaust hanger fitted to the rear subframe via some sort of "P" clip.Remember there is no rear mudguard/indicators/light unit to get in the way.The later bikes have a bracket bolted on where the rear mudguard and indicators should be.
2.Duff chip?
3.All the Corse bikes appear to have a tank vent in the same place as the later road versions.I guess a vent could be fitted to the tank,fancy getting the Black and Decker out!?
I guess a firm that specialises in racing bikes/parts should be able to help.
[Edited on 8-8-2004 by KeefyB]