Just keep in mind....if you go sn95 rear the 03 04 cobra wheels will stick too far out in the rear.
I've got the even wider IRS in my car and use 09 and up 18in wheels.
The s197 wheels would fit great with an sn95 rear in a fox.
The front suspension can use sn95 length control arms, caster camber plates, and one camber bolt ( in each strut ). That would allow you to match the track width front and rear and use the same offset front and rear ( s197 wheels )
The front fenders and bumper splat from a 91 and up fox would give the added room needed to swing bigger tires up front. The sn95 control arms move the wheel a little forward.
My car is an 88 and I haven't changed the fenders or arms. Just used a 1/2 inch spacer and morrosso 3 1/2 inch studs up front on 94 spindles. I only run a 245/40r18 tire up front.
That s197 has an electronic transmission....how do you plan on tackling that ?
Edit: not that the motor isn't.... Just wondering if you're planning to sway the whole harness and gauge cluster ?