mbrun - you don't say anything about what you plan to do, so I'm not sure exactly what you're looking for.
However, I bought this X500 hitch along with the box blade from my JD dealer. Both are for sale, btw, since I recently bought a 4310. (Sorry I don't have a better angle on the hitch itself - if you want more detail I can take a different shot when I get home on Wednesday.)
It's not actually a 3-point hitch, but does give the ability to raise and lower the very heavy box scraper blade. There is a tall handle that can be reached from the seat, allowing you to control the position of the implement.
The picture doesn't convey how sturdy this darn thing is. It's pretty stout.