( edit ---- darkminion -- doesn't the Case sleeve hitch have an upright too? )
I think that is a Case sleeve hitch adapter. I'm sure the Case enthusiasts would have no problem giving you a fair price for that one.
If you're interested, I make a heavy duty sleeve hitch adapter for the Cubs
http://www.onlycubcadets.net/forum/s...ad.php?t=20875