From the Luk catalogue, found here:
http://www.schaeffler.com/remotemedi..._170_us_us.pdf , it agrees with Exedy that the spline dia. is 1-3/16" with 21 splines. It also agrees with the overall disc diameter of 9-1/4" The correct Luk kit number is 16-018 for our cars, located on page 188.
I've seen other places selling the Exedy kit, but I have no experience with them. I've used Luk in my Supra, Celica, and Toyota Pick-up with good results. They can take a moderate beating if you do an occasional burn-out or do some performance runs. I know for a fact I abused that clutch on the pick-up more than a few times, and it still lasted better than 100,000 miles before I changed it out again.