This is the door latch mechanism from inside the Rear Passenger Side ( RH ) Door, taken from a 1958 Cadillac Fleetwood. Will fit 1958 Sedan's as well as Fleetwood's, and may work for 1957 as well, but please verify it is correct for your application before purchasing it. This was in working condition when removed from the car. Needs a good cleaning and some new oil / grease but otherwise looks fine. Some minor surface rust, but nothing much. Comes As Shown, As Is. Please let me know if you would like any other pictures of info. Thanks