my yamaha rd350lc (82) linkage, slips right on, the lever is shorter, but will work, the lever boss is thinner , so you would have to shim it a bit. I will be buying a pattern one for my bike.
If you are in the states, i would look at rz350 ones..
I would assume various honda ones would work, would be worth a hour or so at a friendly bike wrecker.
I know intercepter levers (mid eighties) are aluminum would look good.
Gerry