Hey, i just went through this last week. I got two 5mm spacers from Will Turner, Turner Motorsport. Don't even attempt to use the generic Pep Boys spacers, they don't center on the hub and are poor quality. I learned the hard way. Turner sells H&R hub centric spacers that fit perfectly over the hub, real precise. They even came with the needed longer wheel bolts for real security. They are $50 for the kit and are worth it for the precise fit.