T-56 Transmission Install Thread

So I may have a shot at finally picking up a T56 for my build, but I had some questions regarding the clutch. The clutch listed on the first post here comes back at 21 splines, but the information I'm finding on the T56 is that it's either a 26 or 10 spline shaft (depending on which model). Can anyone confirm their clutch part numbers for me?

As far as clutch and pressure plates are concerned, I assume they must be fairly standard and not necessarily too brand dependent (ie. a 10.5" clutch and pressure plate will bolt to any flywheel designed for a 10.5, Chevy, Mopar, or otherwise)? I've already got a 4 speed in my car now, so I have the flywheel already if this is the case. Technically speaking I could possibly reuse the pressure plate I have as well, but I've read mixed thoughts on that one.