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The owner's manual should list all tire sizes that will fit on the vehicle. The 'stock' suspension/wheel package on the GT is for 245/50-18 on all four wheels. I'm not sure if the sport suspension has larger brakes, but if not, then you may be able to use the same on all four. If it isn't in the manual, the dealer should easily be able to tell you what would fit.
Higher profile tires will ride softer, and will affect maximum dry road performance, but if the weather is bad, you couldn't use it anyway! Optimum snow tire use often calls for smaller tires, as wider ones tend to float on snow; narrower ones bite in.
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