http://www.etrailer.com sells receiver hitches from draw tite and reese I believe. Or, do a google search. Also U-haul sells and installs hitches if you don't want to do it yourself or if the wiring isn't your thing.
I had one fabbed at ohio trailer, it was a mess. I ended up grinding the whole thing off once an aftermarket unit became available. It bolted right up and uses existing bolts for mounting points. It does sit below the rear bumper but just below it. For my purposes it works fine and should also protect my muffler and rear bumper from stray rocks and ledges off road. Yes, it takes a degree or two off the departure angle, but it beats having nothing at all if you have to tow.