I bought one of the Agrisuppy seat with the wrap around back support and installed it on my YM 4220 but it took a ton of modification to make it fit to a position that I could still get into the seat. The seat is much larger than the factory seat. I had to remove the metal plate that tied the fenders together in order to slide the seat back far enough to give me some leg clearance between it and the steering wheel. It sets up about 3 inches higher also, which was good for me as the original seat was too low for me. Thankfully I had a welding machine and some scrap metal because I had to totally redesign the supports for the seat. A little redesign, removal of parts of the tractor and everything works. It was all worth it. THe new seat is 1000% better than the old one, much easier on my back. I dont know if it would work at all on the smaller versions. Maybe, just have to do some experimenting.