Q: Will the 21-inch CYBRHEX bolt onto a Plaid without extra hardware?

Yes. The fitments, 21×9.5 ET35 front and 21×10.5 ET35 rear in staggered form or 21×10.5 all around in square, are engineered for the Model X and Model X Plaid. Each package comes complete: four CYBRHEX wheels, four tires, four TPMS sensors, mounted and balanced. It clears the factory brakes and fills the arches without spacers. For a cushier sidewall on rough streets, the 20-inch CYBRHEX package drops the diameter while keeping the wheel.