For the rear wheels, will a 3.75 " backspace work OK? Same wheel (15 by 7) and 255/60 15 tire? Found some American Racing Outlaws at Summit, AR61, they have a 3.75 backspace.
Not without some lip trimming. If you take a inch from the back it adds it to the front and that's damn close already. One side I can not get my fingertips through the gap. I would say 1/2" or less.