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Use a offset calculator to compare your current wheels to the new wheels. With the new dimensions, check the car with a tape. Do you clear the suspension, brakes calipers and fenders? Reference: http://www.1010tires.com/WheelOffsetCalculator.asp
I have 41mm in the back and it looks ok. Just like the OEM Rays 06/07 Grand Touring wheels. But then again my wheels are 19x10.5 in the back. What dimensions are your new wheels going to be.