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Yep! The 305/30/20, though a shorter sidewall, is actually more like the factory sized overall diameter, so your speedo wont read incorrectly. I run 315/35/20 which is way oversized, just for the look, but my speedometer reads off by about 5%. Between the 305/30/20 and the brembo packaged 255/40/19, the difference is only 0.64%, which is very close to stock, so much so that it's a perfect fit. And YES, I'm that **** about fitment
The first car in this thread is my car, and I know I run 20x10 ET41 and 20x11 ET55. I have 315/35/20's on the back and I rub on the outside fender (thanks to being low), and the inside felt against the inner fender closer to the center of the car. I'd recommend 305/35/20 or smaller, or go with 305/30/20 for the better fitment for the rear tires if you want my fitment.
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