~~Here is a New Fuel Sending Unit Assembly for your 1959 - 1964 Cadillac Hearse or Ambulance.  Comes with gasket and screws.  Please see Picture for the items you are bidding on & to see if it will work for your application.
 

Don't fall for imitations that could give you an inaccurate reading, this is the correct one for your Cadillac.