From the King Kutter manual, it clearly shows it's supposed to have a "swivel kit", which is part 16 in this drawing. But I see a LOT of 3PH equipment, particularly cutters, without it. This not only makes the top link connection too stiff, it precludes the use of a quick-hitch. So yeah, you can get the quick-hitch adapter, but you should really use the swivel that comes with the cutter.