On the Luk site, I see this:
LuK RepSet 04-002
Application 1971 Pontiac Firebird - 8 Cylinder, 350"
Description 3-Spd, 2Bbl
Disc Specifications
Outside Diameter 10 3/8"
Spline 1 1/8"
Teeth 10
Flywheel Type - Flat
http://catalog.schaeffler-aftermarke...0%22&qualfier=