Hi Peter,
I agree 100% with the others. Wait until you have the wheels with tyres on the car before investing in a set of spacers. I attach a picture of my GTS with 295/50/15 Avons on the rear and I think the look is pretty much spot on - just right for the age of the car. If anything I think the fronts are too far inside the GTS arches, mine are with 225/50/15 and if I could find a decent 245/45/15 or similar I would put them on in a flash. Maybe a slight lowering of the whole car - with height adjustable coilovers could also toughen up the appearance a bit more.
Cheers, Tim.
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