Chad96SS

I had my heart set on a pair of 17X11 SS style wheels for the rear of my car until I saw a few cars on here with Z06 wheels. I would love to use them on mine, but I also would like the extra width the 18X10.5 rears would give me. Would there be much difference in making these fit as opposed to the 17X11's? I know a 315/35/17 will fit without too much hassle, but I don't know what kind of problems that extra inch in height would give me, if any. If anyone's tried to fit these monsters yet, I would appreciate any insight they can give me. Thanks!!