Final Drive.
I need to replace mine, splines fairly worn. Bike is a 1977 R100/7 and the ratio is a 32:10. What are the model years that would bolt right in? I found a 1980 but I am not sure it will be a direct fit. Plus, if you have one and would like to part with it, like I said, I need one. And of course looking for the least amount of wear, don't need to get right back where I am!
I've got 105,000 on mine and they are down to the 25%-50% range.
Final Drived