The GTS wheels are 6.5" width. I would think they are the same as yours but don't quote me on it.
I have been running 225-45-17's on my car since about 15,000 miles when the Goodyears were replaced. The tire size is just over what is recommended by tirerack.com for a 6.5" width wheel but discount tire's site says it is cool. I have 90,000 miles now and have never had so much as a nail even.
My car wears tires out really bad (15,000 and they are toast) but I have a very aggressive alignment and drive it hard and buy tires that don't last long. I don't blame it on the size in other words.
Just put the 225/45/17's on. That size is really generic and easy to find deals on.