Well, it seems that the new clutch disk and old one both have a .32" thickness.
The 3 forks on the old pressure plate seem to be about an 1/8" taller than the new one? Both plates have the same overall depth when not on the flywheel.
I got the transaxle back in with the old disk and pressure plate. Wanting to see if it goes back to working correctly. That will also give me a chance to get a long throw slave if needed.