1996 -1997 Audi A3, 5x100, R15"x6", ET38 rims with 57.1mm centre bore fit on a Subaru with 4 pot brakes. They're basically WRX rim offset, so sit out wider than the factory Subaru steelies but still sit within the guards.

Image stolen from dirtyimpreza forums and linked at bottom of this post.
Test fitted them on my car and they have heaps of room over the 4 pots.
They're light (5.8kg) and forged alloy - so they will bend and not shatter like most after market alloys.
2 small problems with them- they use a ball seat lug nut (Subaru are cone type), and the Audi center bore is 57.1mm compared to Subaru's 56.1mm.
The only source of M12x1.25 ball type lug nuts i can find was here:
http://www.otisincla.com/product/B-D31R ... l-Cap.html
The alternative is to get cone to ball seat adapter washers. Much cheaper, but i decided to go with the lug nuts. Conversion washers here:
http://vwparts.aircooled.net/Ball-Seat- ... washer.htm
The only source of 56.1mm to 57.1mm hub centric rings i found here:
http://pdt-services.com/en/centric-ring ... to-56-1-mm
Post '97 Audi rims are a different stud pattern. Make sure you get 5x100 Audi wheels! Do not use cone type lug nuts on the ball seat type Audi wheels without an adapter washer.
Will sort out some pictures later.
Cheers,
Rhys
Sources of information:
http://forums.nasioc.com/forums/showthr ... ?t=2064503
http://www.dirtyimpreza.com/forums/show ... 461&page=3