CIH2188,
I don't know when they went to the pto style, but I'm pretty sure a 2188 and 1083 should have the hex shafts. What you might need if you have a field tracker and want to use it are the flexible shafts that work like a pto shaft going to a tractor. They just have the hex female end to mate with your combine's hex shaft. When I modified our 1083 to line up with our 1688 we didn't want to spend the money on the kit, so I can't use my field tracker, but I don't really need it on our terrain.