Since this has just come up again here, I have my 15" rims and tires up for sale (again). These are "sport rims" that were intended for a Mercedes 190, they have Kumho tires with around 2,000-2,500 miles on them. One is missing the center cap, otherwise they are in excellent condition, no curb rash or dings. All that is needed are the lugs/bolts that the stock alloys use, the fronts require thin spacers but I am including those. For those that will tell me they don't fit a Vanagon, here is a link to pics of them installed on mine:
https://picasaweb.google.com/veedubguy84/MercRims#5586725354467231810

I have had these rims/tires on mine for about a year now. Looking to get $375.00 for the set. I am located in Round Hill Virginia, zip 20141. Round Hill is 15 miles west of Leesburg, Virginia and 45 miles west of Washington, D.C.

Jeff Stewart