Will 18 x 8.5 wheels fit my S4?

[Sue Kraft]

Has anyone tried 18 X 8.5 wheels (front and back) on their S4?  I've
been drooling over a set of 18 X 8.5 BBS LM wheels, but Tire Rack says
they won't fit.  The Wheel Source, on the other hand, says they will fit
no problem, and will gladly sell me a set.  I'm also a little concerned
with the ride quality going to 18" wheels.  Any opinions/experience with
wheel/tire fitment on the S4 would be much appreciated. (And sorry if
this has already been covered.)

Sue
'94 S4