TireRack shows Volk RE30 18x8.5 as a valid fitment for a GTS (which should be the same).
Offset: 47mm
Backspacing: 6.65"
Bolt Pattern: 5-114
Rec. Tire Size: 215/45-18
Weight: 16.6lbs.
Shame they're $800 each, but at least we know something else that size would likely fit.
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