Yes. The 10.5 bullits w/tire will hit the IRS bolt w/o a spacer. A 3/8" spacer is required to clear the bolt, with 285/40 tires. I think you'll need a larger spacer to clear the 315's. In addition, when I put the 10.5" bullit wheels on, the inside of the driver's side wheel rubbed the tire rod. I would have had to grind it down (I ended up going w/a 9" wheel).