Fitment
The SS center cap should fit just fine.
A 38mm offset on a 9" or 9.5" wheel will fit very nice. My Fikse FM5's are a 38mm wheel, fill the wheel wells. The only issues you'll run into, especially on a lowered car, will be at the front the tire will gently rub the black inner fender liner (no biggie), and in back the passenger rear tire could make contact with the wheel well lip, causing some gouging on the corner of the tire tread. This could be easily fixed by rolling the quarter panel lip.
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