All of them either have the starter clutch on the end of the crank or the cup on the crank. All the cup style will interchange, and all of the clutch style will interchange, or at least every one I've ever tried. The only difference is slightly different looks, and on some, the rope comes out of the housing at a different angle, which can most of the time be changed by drilling the rivets out and moving to a different set of holes on the shroud, and re rivetting or attach with screws and nuts.