This article is from the VW Performance FAQ, by with numerous contributions by Jan Vandenbrande others.
A:Most VW rims are interchangeable, and it may provide for
an inexpensive upgrade from you stock steel rims to used
stock alloy rims of an other VW. The exception are the
Corrado G60 and the SLC which both require a rim with
minimum 15" diameter; the Jetta GLI/GTX 16V (and I think
Passat) require a minimum 14" rim, while all other VWs
will take 13" rims.
VW uses five distinct bolt patterns:
5/180mm (?) Early air-cooled
4/130mmLate air-cooled
5/130mm (?) Transporter/Vanagon
4/100mmWater-cooled
4/100mmWater-cooled
5/100mmVR6 models
The standard rims will also work on any car with a 4-bolt
100mm hub. These include Honda (some models), BMW (3-
series, 2002...), Omni GLH, Mazda (Miata and possibly
others), and any Audi 4-bolts before they switched to
108mm.
NOTE: Check OFFSET and center opening before attempting
swaps! VW hubs *MUST*BE*HUB-CENTRIC*. This means that the
hub opening of the wheel must fit the wheel hub snugly
enough to center the wheel. THIS IS IMPORTANT!
Note: The center hole of a Honda rim is too small to fit
on some VWs, and the offset is wrong.
 
Continue to: