If you find 3 of them add me to the list.
I have an 1931 Hart-Parr 18-27 that is in need of a carb also. I also have an 18-28 that has a perfect carb and I bought the floats and gaskets from the folks below. The old Deere's used ensign also and the repair kits worked OK. Maybe they have the carb you need. Good luck.