Check your camber- I can't tell from the pic if you've got positive or negative.
But the 944 spindle (steering knuckle) has a lot more positive camber than the supers one and often thats the reason the wheels won't fit under.
You'll need to run some negative camber. If you can't get enough from the inner adjustment on the control arms then check out Toplines camber plus kit. Or there was a post here not long ago where someone tried using the offset bolts that adjust camber on the strut to knuckle bolts.
http://www.germanlook.com/Forums/sho...ghlight=camber
Cheers
Jeremy