Is the car painted and you don't want to modify the wheel lips/openings?
If not....
Lip the top of the front fender lip, cut/fold a 1.5" wide x 3" tall pie slice out of the bottom front fender lip. Then use the lower fender support brace adjuster to hold the bottom of the fender out. Also, if you fender has upper fender braces, move them out as much as possible....
With all that, you can run 275/40/17 tire up front with 17x9 rim with 5.25 to 5.5" backspacing.
Then you'd have the same size tires front and rear.