It's the remaned rcf-4201 clutch disc, 9 11/16 disc also from 83-84 Firebird 2.8. From what I have found the 9 1/8 would work but will slip under moderate acceleration. You lose too much clutch surface area. If you have a flat pressure plate, that is the springs the throw out bearing rides against,I would also recommend getting a peaked one from them. The flat is the old design and has tendency to prevent shifting at higher speeds. Just be sure it's for your flywheel and not the Firebird.
