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Louisiana Special Plates. This site allows you to view Special Plates and calculate the cost to convert from your current plate to a Special plate. 1  Please be sure that you have properly titled and registered the vehicle in your name.2  Have your current registration available to enter and verify vehicle information. Special plate fees vary. 2  Special plate fees calculated on this site are valid for regular license plates only. 3  Click here to View the locations where you may purchase Special Plates. 4  To contact the Specialized Vehicle Unit you may call (225) 925-6371 or call 1-225-925-6146 for assistance.