desmosabie

I bought an exedy pressure plate and throwout bearing with a 13lb. flywheel from e-bay but , I still need the disc . Subaru offers two for my car and one is a 5mm "stock" and the other is a 8mm, "heavy duty/SPT". Problem is nobody seems to know if the 8mm will work with my exedy pressure plate. They say that the 8mm may not disingauge when the pedal is pushed and that i have to buy the subaru pressureplate for the 8mm. I would like to get the "heavy duty" and i doubt that the problem they mention is an issue . Any info would be greatly appreciated, especially since it's been 2 months with no car now.