the best thing about aircooled VW is that we have no studs on our drums or rotors, b'coz of this you can test fit the rims, by using two jacks, one is to push up the car and dismount the stock rims then lower it to it's original height, and then the other jack is to support the suspension to it's original height so you can test the rims if it will rub on any part.
Norrowing is not required, just a 1/4 spacer, but test fit it first b4 you buy a spacer.
Here's a pic.of the front, the rims are 16x7 with an off-set of +40, it is wrapped with 205/50R16 tires.