There were 3 clutches for it. I never have been able to find where there was a serial number split. I've put two new clutch/pressure plate set ups in mine since I bought it. I was kinda under the impression that the aftermarket replacement was a one size fits all thing. It came with new bolts and they were a different length than the originals. I don't remember if they were longer or shorter.
I don't know what your mechanical abilities are, but that pressure plate has to be split apart then set up correctly with the new clutch. Both times that I've replaced mine, I've taken it to Clutch Dynamics in Lansing Mi. They're pretty straight shooting guys, and both times they've told me that the pressure plate was beyond repair and I've had to buy the whole thing.
I've never used a spline aligning tool for them. The clutch is squeezed in the pressure plate so that whole thing is set right and won't slip out when you put it on. The PTO clutch is the only thing that needs to be aligned. I just wrap a few layers of masking tape around a long half inch extension so it fits snug in the clutch splines.
As far as the throw out bearing, again, three possibilities but no serial number split. I found a manufacturers number on it. The guys at the auto parts store couldn't get it, but they did cross it to an AGCO number for me and I was able to get it from the dealer on the first try.
The tractor is a pretty easy split. Take out the fuel tank, then unbolt the dash and lay it up over the engine so you can get to the bell housing bolts. I'd rather do ten clutch jobs on a 1365 then one on a White 2-105 with a cab.