Mount your tires on your wheels . Put
Them under the car and measure between them . That’s your total housing (plus brakes) width . That’s what I did and it fits looks perfect
This is what I did. After having the tires mounted I made a fixture out of 1 1/2" angle, basically a tire rack to set the tires in so they would stay square with each other. Then used a floor jack on each end to raise them into the wheel wells. After centering them up I measured the width I needed minus the rotor thickness.
