The 71 that I am currently building was missing all of it's primary innards. I bought a complete set of everything including the spacers and shims. When I opened up the clutch I found it had bronze plates which I guess indicates the stuff came off an 850 or that someone had substitued bronze plates in a 750. Two questions: If the stuff came from an 850 will it work on my 71? Second, I'm inclined to use the bronze plates and see how they work. They don't seem to be too worn. If no good it's a relatively easy job to change to Barnetts which I've used in other bikes. Is there anything differenct I need to do to use the bronze plates.