WTB 10.5" Externally Balanced (for 360) Flywheel

I've decided to go with the Centerforce Dual Friction Clutch 10.5", I noticed it's a diaphragm style...I've also seen flywheels labeled for diaphragm style as well...not all flywheels are created equal? Must it be diaphragm specific?

Was looking at this one...because I can't afford $300 for a brandy new one...

http://cgi.ebay.com/ebaymotors/MOPA...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Thanks!
Craig