I would contact Centerforce and let them know what clutch and pressure plate you have and what car this is for and they should be able to tell which throwout bearing should be used.
If using on a traditional Pontiac engine, I would use a throwout bearing for setup which should be your typical GM throwout bearing.
Thanks,
Mark
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1965 GTO: 467 (Built By Dan Willever), 400 Block, Eagle 4.25 Stroke, Eagle 6.8 Rods, BRC Pistons, Custom Grind Hydraulic Roller Cam, Edelbrock 72cc Heads Ported, HS Rockers, Doug's Headers, Edelbrock Victor 4150, QTF 850 Carb, AutoGear M22 4 Speed, SPEC Clutch and Pressure Plate, 12 Bolt 3:73 Posi.
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