Crap my front tires are hitting my fenders!!!

Tread width may be 6.5" but the section width of both tires will be the same. 215mm divided by 2.54 is a section width of 8.45" 60 % as tall vs width yields a tire 25.2" dia on 15" and 70% is 26.9" dia on 15"
Wheel offset may be causing you an issue too. Are your current wheels the same offset as your other car?