This tiller is set up for cat 0 and cat 1. Looks like it was originally sold for the 4x5 garden tractors, with a shorter male ended pto shaft, and the 4100 compact with a (I'm guessing) longer female ended PTO shaft, which appears to work on the X series as well.
Mine has the 4x5 shaft with male end.
Is BM18995 the right shaft for my 2320 or is the length not correct? Its listed for the 4100, and also the x series, and the later version of the 550 tiller for compacts.
I'm willing to trade shafts if someone wants the 4x5 one and has the female version, assuming it is the right one for my tractor.