The 01+ 800/900 big twins use a clutch with a 33mm taper vice everything else using a 30mm taper. So short of modifying the PTO stub or Clutch, it will not fit. Also, the 660 four stroker has different diameter, so I would avoid that one also. All the others should work though. There are a couple of other oddballs out there to. Early pantera's had a longer pto shaft, so those may not work either.
Keep in mind you will have to recalibrate whichever clutch you put in, unless you find one that was supposed to go in that machine. I believe the clutch that came in your sled was either a version of the Comet 102c or one of Artco's own models. I am leaning more towards one of Artco's though. I thought Cat went away from the 102c's in the early to mid 80's. Maybe when they went under for a spell.
Waldo