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The rears are 8.5 inches wide, stock, on the IS 350. You could run 8's all around if you want to do a square setup with the same size tires at front and rear.
Right, so for the rears you would need the 8.5-inch-wide wheels. Personally, I would prefer using the OE sizes in this situation to make the tires and wheels match up the best.
Wheel
