Good luck finding one
I don't know of anyone making an aftermarket version yet so prices are sky high. If you can find a complete one for $500 or less, jump on it, that is about what they bring on EPay. I picked this one up for my 3205 about 6 years ago for $200.
There are 2 versions of the hitch for the 3k tractors. The early version with the twin disc brakes take the 365 hitch and the later machines take the 207 hitch.
DSCN0202.jpg