Agree with KillerBee on this one.

First, pick out the Bell Housing your vehicle supports and determine the size flywheel it takes.
Second, pick out the proper flywheel for your Bell Housing
Third, once you get those two then you can pick out the clutch you want. Most cars use the 130 Tooth and I chose an over sized or scalloped clutch that measures ALMOST 11" but it was designed for the smaller flywheel.

I screwed up before and went out of order and ended up buying two bell housings and two clutches.