The 1772 radiator is unobtainable. I went through almost 300 radiators looking for a match.The radiator that I used was for a Kubota L175-L1801.
https://www.ebay.com/itm/166012959031 It has 1-3/16 inlet and outlets. I used silicone turbo adapters and these hoses
https://www.ebay.com/itm/125433815801 for the top and bottom. These hoses are also a hack for replacement of the top hose. You cut one of the ends off and it's a perfect fit for the 1772 1572 etc. I cut the front engine cradle back and set the radiator in after making custom brackets out of 1/8" steel. The holes it the1772 front cover match the pre-drilled and nut-serted holes in the radiator. The nut-serted holes are 6mm x 1.25. I took the thermostat out and put in a 1-3/8 1/4" thick stainless washer that had a 7/16 hole in it, to slow down the flow. Fan wise, I used a SPAL Universal 9" - 590 CFM Electric Pusher Fan - 30100381. The tractor would run at 150 degrees on a 100 degree day.