Saw this on VWvortex (not mine, no relation, etc, etc.)

http://www.vwvortex.com/vwbb/Forum33/HTML/000033.html
"OEM Trailer hitch for late model Vanagon.
This is the real thing. German OEM trailer hitch. Great shape. Its the
european 50mm gooseneck ball which translates to a 2"
US ball (I think) It's been up in the attic for a few years since I last
used it. Make offer if interested. "

Keith Adams
Calgary, Alberta, Canada
1986 Vanagon GL Westfalia