4 cycle clutch on 3pg
 

Was wondering the differences between the 4 cycle and 3pg drive(primary) clutches are. I have 3pg with wore out sheave. Don't want to spend $400 on an aftermarket clutch and can't seem to find a used 3pg drive. I can find 4 cycle clutches, but want to know if the sheaves are the same. In other words I want to use some of the parts to fix up my clutch. I'm sure the spring is different, but will the sheave work?