It's easier just to post here.
I have checked my serial number on bobcat parts but I'm a little unsure. My bobcat has an M in the middle of the serial number stamp and if I enter it as stamped it comes up invalid. If I delete the M it shows parts for it but im not sure that is correct. I can try to identify the drive motor that's in it to see if there is a way to compare. If you have them on a table and move the shaft if will moves back and forth or side to side. Assuming yours are the same how much you selling them for?
After looking, I think I have both styles of motors. The older 743 motors have the hose connections at a diagonal and the raised part around the shaft looks like a clover. The newer motors the connections are in-line and there is a +- 1/4" ring around the shaft.
I'm pretty sure that both have the "wobble" shaft
The newer motors that I have were off of a 753 but It looks like they were also used in the later model 743's. I'd have to try and do more research.
I would do $900 plus shipping for the pair of the old style motors. That is if I can figure out how to package them up for shipping. They weigh about 50 lbs each.