Did you ever put the sportlines on the rear? If so how did it look? I have the same exact Wheel and Tire setup as you except I have a 2006 Mustang. I have the Ford K Springs and I am okay with the front but the tire Gap in the back is a little too much so I was thinking of doing the same thing and buying the Sportline Springs (sucks you can't just buy the rear springs) just changing up the rear.