This is a NOS (new old stock) 1964 1/2 Ford Mustang, Cougar, Shelby GT-350 GT-500, Fairlane, Falcon and Comet Oil Pan Drain Plug.  This is an original Ford part.  Part number D6TZ-6730.  The plug fits 170, 200, 289, HiPo, 302, 351-W, 351-C, 390, 427 and 428.  Includes Shelby T-Pans.  Does include Ford Box.  You are purchasing one drain plug with a NOS nylon washer.  Please look at the pictures closely, check part number, do your homework and ask questions before purchasing.