Been barking up this tree for a bit. If I may add to the confusion, from the same site there is a listing in the link below for a clutch that ?fits? 1990 ZR-1s only. To my knowledge, there was no difference in the pulley diameter, connector or clutch design that is different year to year for ZR-1s. Unfortunately, these sites have a lot of help that is not familiar with specialty vehicles within the Corvette brand.
https://www.topflightautomotive.com/...SABEgLSdvD_BwE