Yes, good to know about the brakes. That's something i'd forgotten about, but if they've been on an AERO with it's bigger brakes. It should workout well. I know some people here swap wheels between Saab and Volvo, them being mostly 5/110 and 5/108.
Saab make some decent looking wheels; I'd think they should work fine on a GTI. Try finding a set of 17 inch Double Three Spokes, or perhaps the 18 inch Turbo X wheels! IMO the two best looking wheels Saab ever made :thumbsup: