I'd stay away from the stage II from SPEC, just because of the kevlar lining. Do a search if you'd like, but stage I or III (depending on the extent of mods of course) are the only 2 I'd point you towards other than a LUK OEM SVT clutch.

Mahalo

2005 Ford F150 SuperCab FX4 1964 Chevrolet Impala SS 1998 CSVT: 354HP/328TQ @ 10 psi, now gone