Ansung, Buhler/Allied, Bush Hog, Great Bend, Servis-Rhino, Westendorf, Woods Equipment - just to name a few. You might want to find out what brands your local tractor dealers sell. Then contact the manufacturers to find out if they have a mounting kit for your tractor and if they do, whether the mounting kit is compatible with your MMM. The manufacturers could also give you information as to who their local dealer is.
There is a member here, Rback33, who could probably give you some pretty good guidance, if you PM him.
Good luck in your search.