WHAT FLUID IN A KUBOTA T1400h HST TRANSMISSION?

I just got an older Kubota T1400H OHV HST mower with the hydrostatic transmission. It needs a lot of work but I couldn't beat the price - free if I'd haul it away!! I cleaned it up and got it running but the small reservoir near the HST fan is empty and I don't know what fluid to put in there. Any help would be appreciated.

Also, I'm going to need some other parts to put this thing back into service. Any recommendations out there on good reliable parts suppliers?

Thanks.

WHAT FLUID IN A KUBOTA T1400h HST TRANSMISSION?