We got an Afam to fit on a JT carrier. It's pretty tight, though! You'll need a hammer and the sprocket will peel back a little bit of aluminum on the carrier when going on. The more-highly evolved Ducati snob would consider it substandard, but I opine that it is a workable solution and it looks like JT just copied Afam's design then added a change here or there to not be a Xerox copy.
Chris