looks like you got it figured out but ill tell ya what i did anyways.
i welded on a cheap 2 inch from harbor freight, they had the smaller tube ones as well. Cost 9 bucks and a friend with a welder.
ATV Hitch Adapter
i welded on a cheap 2 inch from harbor freight, they had the smaller tube ones as well. Cost 9 bucks and a friend with a welder.

ATV Hitch Adapter