That's the one I have. I got mine last year with my new 2520. I'm in Canada, and it cost me $250. Seems like a lot of money, but when you consider freight, I don't think I could have paid someone to make me one for much less. Especially wanting it that nice JD Green color. As I remember, these are not ordered through JD's regular parts and are sort of a "drop ship" item which come from some special warehouse. Mine also came with the bushing kit, so it will attach to my "I" match. It just uses the cheapo bushing kit, not like the one's they use on the ballast box.
I pretty much leave it attached all the time. A great place to wrap up and carry my tow chains on the tractor.