I am about to order some 18x8" TSW Thruxtons wheels for my 05 GTO. I was planning to play it safe and run that size on all four corners with 245/40/18 tires. If I were to get 18x9.5" wheels in the rear with 275/40/18 tires, would I have to roll the fenders? I do not want to roll the fenders so I am thinking the 18x8" wheels all around is my best bet. What do you guys think?