Andrew,

To make the rim fit you have to mount 20mm spacers. But
there are other issues as well. The center hole does
not fit the front hub cap of the Vanagon. Additionally
the allowed load per rim is only 590kg, Vanagon requires
at least 650kg. The nuts and bolts have to be turned
at least 7.5 turns before they get tight.

I took some pictures, you will find them at:

Whole Crewcab
http://albums.photopoint.com/j/View?u=1327568&a=9868284&p=32783418&Sequence=
0
4WD front
http://albums.photopoint.com/j/View?u=1327568&a=9868284&p=32783420&Sequence=
0
4WD rear (=2WD rear)
http://albums.photopoint.com/j/View?u=1327568&a=9868284&p=32783422&Sequence=
0
2WD front
http://albums.photopoint.com/j/View?u=1327568&a=9868284&p=32783423&Sequence=
0
Letter of conformance from Audi
http://albums.photopoint.com/j/View?u=1327568&a=9868284&p=33036140&Sequence=
0

I do not recommend to use this rims on a Vanagon.

Rgds
Helmut
'80 Vanagaudi