I have the 9 - bolt clutch on my 47 3600. The 9 - bolt is the heavy-duty clutch. I re-surfaced my flywheel and the pressure plate myself on my Bridgeport rotary table and a cupped stone in the spindle. I do disc brakes the same way. I bought a new clutch disc for my truck. It works perfectly. I'll never wear it out in my lifetime. I would not hesitate to use your 9 - bolt clutch.
