just got my mach1 calipers and 13" baer rotors. i now want to put the 13" rotors on the back... the only caliper brackets i can find are the ones where you have to pull the axel out and blah blah blah... i just found a bracket that roush makes. i was just wondering if anyone has any info on it, they say you need an 18" rim to clear the new position of the caliper. i have heard that if you use a wheel spacer that it will work. any ideas?