There are many aftermarket Vanagon wheel options. The two most popular (based on numerous Flickr searches) are the Mercedes Replica 8 hole wheel and South African Rhein Vanagon wheels. Both wheels are available in 15" and 16" sizes from your favorite Vanagon shop or classified site. The Porsche B32 Carrera Vanagon featured the classic 911 Porsche Fuchs wheels.
Porsche Fuchs Wheels
South Africa Rhein Wheels
Mercedes 8 Hole Wheels
Ronal R9 Wheels (out of production)
You can find Mercedes Replica Wheels and South Africa Wheels at: