Measure the contact face of the flywheel and see what that is. The 55-57 235 flywheels for example (not the HD versions) will measure 10 inches yet they came from the factory with a 9.5 inch clutch. Pressure plate measures the same. So you can use a 10 inch clutch plate. So after measuring, if you have say 10 inches on the flywheel, next measure your pressure plate and see where you are at. If the pressure plate you are using with the 9 inch clutch does not measure 10 inches, then you need to find one that is 10 inches and will bolt to the flywheel.
Just asking here, how much difference is there in the cost of a 9 inch vs 10?
