koolbotaman,
I would say that's a good price. There isn't a lot that can go wrong and they all get scraped up when used, so even if it's not perfect cosmetically, you can fix that. You won't find one for that price new....and new blowers are in short supply apparently.
I have a BX2750 and my neighbor just bought a BX2750D for his Kubota. His blower mounts differently to his larger tractor (B2620), but the blower housing, measurements, and mechanisms are all identical. The D model has some minor improvements that I wish mine had.....for instance, the shear plates for the fan are easier to get at if a pin were to shear. I think the letter at the end of the model number just signifies the latest updated model of the time? I expect that the quick mount to fit your tractor would hang off the front frame, like mine (I have a BX1800.)
I would only suggest if you pick up the unit, that you take it apart and make sure all the nuts and bolts are tightened....they tend to come loose and could cause a headache if the wrong one lets go. Grease, oil, tighten everything and you'll be very happy with the unit. Dyer, retired