Pat,
YES !,it is on a BX 2200. I will measure the PTO shaft and send you an e mail Saturday. If you order it from Ken do not forget to ask him for a truck with a lift gate. Made the entire process of getting it off the 18 wheeler real easy. Ken will prep the tiller, all you have to do it cut the PTO shaft and you are ready to go. Did you get a slip clutch with it? If so, make sure you loosen all the bolts on the clutch , to insure the clutch is free turning, and then tighten the bolts about ½-3/4 turn each. This is a much easier process if you do it before you mount the PTO on the tiller. The slip clutch mounts on the tiller end, not the tractor side. Also make sure when you put the clutch on the tiller, insert the bolt that holds the clutch on the shaft and then take your measurement. You will know the PTO length is correct when you can lift the tiller to the top and still turn the blades with your foot with the tractor engine off. If it binds, then the PTO shaft is too long. Worse thing you can do is have the PTO shaft end dig into the tiller or tractor end, good way to tear up a seal.
Good luck.
Tom