This is only rumour, but I have heard that the variants with the 2.5L engine (so, GT in Canadian and perhaps Swedish terms) have larger brakes and so the 15" wheel (which is what came with my 2.0L GS) will not fit on the front. A 16" spare wheel is likely required with the GT, perhaps even with the 2.2 diesel engine.
If you already have the 15" wheel - even if you don't have a tire on it - you can just try it on the front of the car without even lowering the jack. If it doesn't fit over the brake caliper, it will be obvious - no need to drive on it or even put it down on the ground.