Spacers would do the opposite of what you want, effectively lower the offset to say 28 with a 10mm spacer, and push the wheel even further out. I have seen a hatch fitted with 18X8 ET38 and they stuck out quite a bit at the front fender, and the owner claimed they rubbed pretty bad. I would say with 8.5 you'd be in seriously rubbing both front and rear. I would not recommend those wheels for this car. I am looking at 18X8.5 ET48 and expect them to be pretty flush.
~Noel
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