I think you only have to look at eWillys to find another one . . . Unusual rear hitch.

“You will want to look twice at this one, because you probably will never see another one again! Purchased 17 years ago, put into storage container but now need it is time to sell. Complete, yes it is all there. Comes with many, many very to hard find correct parts. NO TITLE so the listing is forcing me to list it for parts but if you can title it, you will be set.”

http://omaha.craigslist.org/cto/4412517702.html