Call someplace like Cook Tractor in Clinton MO. They well sell precision equipment. You could use basically anything up to a 2366 for sure. You would need the installation manuals. You would have to figure out some wiring locations on a 1660 where the newer combines just plug pins in. I once put a Yield monitor from a 2388 into a 1480 and then moved that into a 2188 that originally had a black box.