The RG-R are different from the ones on the white STi, those are the RE. The RE comes in 18X8, 50mm offset for the STi. The RG-R comes in 17X7.5, 48mm offset, or 18X7.5, 49mm offset. These are according to Tire Rack's website. I'm fairly sure you need a 8 inch or wider wheel with that high of an offset to clear the STi Brembos.
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