Used service replacement switch for the rear defog or defogger fan on any 1968 Mercury Cougar or Mustang coupe or hardtop. Original Aetna manufactured switch with the three prongs on back. Tested and working two speed switch. Comes as shown with mounting bracket and chrome knob, bezel is marked "DEFOG" as shown.
*Note - this is not the OEM 1968 defog switch, it is the switch used in defog kits starting in 1970 for many Ford and Mercury dealer installed or over the counter kits.
Replaces Ford part number D0AZ-18578-B.