slick decision

What differential do you have in the duster? Is it a stock length diff or narrowed? How about the 15x10 wheel backspace ? Sorry for so many questions just love the look of your duster! I want that for my dart sport. I have an 8.25.
Thanks. The Duster has a narrowed 9" (2" less than a stock width 8 3/4). The wheels are 15x10 with 5" back space on the 295/55R15 drag radials and 15x10 with 5.5" back space on the 29x10.50w slicks.

Bill