I ordered this one, seems to match the specs exactly: Draw-Tite | 2923 | Trailer Hitch Ball Mount, 7,500 lbs. Capacity, Fits 2 in. Receiver, 2 in. Drop, Black
etrailer.com includes it in a kit with a 2" ball: https://www.etrailer.com/Trailer-Hitch-Ball-Mount/Draw-Tite/DT49MR.html