Hey Travis, I had a chance to talk to the Miller people at 2 of the show's, nice bunch to talk with. They did tell me they are contracted to build for Cat. Don't know all of the size's they build. They wanted input on how well I like my coupler, I gave them my opinion for improvement. It's hard to keep track of everything that's available for equipment.
http://www.millergroundbreaking.com/
This is similar to the wedico coupler
http://www.kenco.com/WBCOUPLER.html
Later, Neil#2 aka doodlebug.