The Citadel license plates are $70 every two years in addition to the registration fee. A portion of the special plate fee, $40, goes to the school for scholarships. You may use the Application for Special Plate (SCDMV Form MV-95) to apply for these plates. This plate can be purchased for cars or light trucks with an empty weight of 9,000 pounds or less and a gross vehicle weight of 11,000 pounds or less.