Not trying to be the safety police but one thing I would try to do is put the ROPS back on the tractor. Maybe you can find a used one somewhere but I don't think I would feel comfortable not having it. It doesn't look like it's HST but unless you had your heart set on HST that shouldn't be a problem. It could even be a plus if your uses include plowing.
Here it is for a buy it now. I would think that if you did not want it you could back out if it is not a hydro like they had it listed.
but I'm not handing over cash until I get to test drive it and check functions