Quite the necro, but this thread is the reason I joined the site. I picked up a pair of Billet Specialties Street Lites for my 2013 GT (15x10, 7.5" BS). I also did BMR Swaybar relo kit. Let's just say they aren't direct bolt on. I'm pretty sure they're hitting the caliper, but my question is how do you guys know which spacer to use? Do you just order 5 different sizes and try them all or are there measurements I can take to help out? I don't mind grinding some caliper if needed, but I also don't want to reduce the integrity of the brakes either. Any help would be appreciated.