I have the 2001 BX 2200 and my sending unit started leaking, I decided to fix it myself, and I had heard about the new unit that fixed the leak. I had the dealer order the new sending unit and after I got the tractor tore down, I found that they had given me the same unit that was in my tank. I didn't want the tractor to be down till the next time I got home, so I cleaned the gasket and the tank area and put it back together with the old unit and silicone sealer. It held just fine till two weeks ago and started leaking again. I think the new redesigned sending unit has ears that clamp inside the tank and tighten from the outside and seem to be a permanent fix. The old unit are just pushed into a ring in the tank.