A new OEM Ford Lock Set that I got at an auction of vintage car parts.  This is part no. E1DZ-5421984-A.  

Comes with two door locks and two other locks as well as some mounting hardware.  There was a small cardboard gasket but it has crumbled apart (see 2nd photo).

For use on the doors, glove box, and luggage compartments on:
  • FORD LTD  (1983: all except Station Wagon)
  • MERCURY FULL-SIZE CARS  (1987: Mercury Grand Marquis GS and LS 2-Door Sedans;  1983-86: Grand Marquis 2-Door Sedan;  1981-82: Mercury Marquis Brougham 2-Door Sedan and Mercury Gran Marquis)
  • MERCURY COUGAR except MR7  (1981-82: all except Station Wagon)
  • MERCURY MONARCH  (1983: all except Station Wagon)
car auto automobile automotive classic exterior interior 1981 1982 1983 1984 1985 1986 1987 81 82 83 84 85 86 87  (SEL BOX)