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The most transformative change to the interior came from these Scat Procar Rally 1000 seats. These chairs manage to do what few others can: They preserve the period muscle car vibe with their styling, stitching, vinyl fabric, and low-back design, while providing the support that only modern seats can give. Procar even makes seat brackets for the '73-77 Chevelle. Seats and brackets will set you back about $750.