Lincoln Mark VIII high beam and low beam headlight bulbs both utilize 9005 size bulbs. The replacement chart covers vehicle production spanning 1993 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9005 is the sole bulb type across all headlight positions in the Lincoln Mark VIII across the 1993-1998 model years, covering both high beam and low beam applications.
The 9005 is a single-filament halogen bulb rated at 12 volts and 65 watts, built on a P20d base and conforming to ANSI standards recognized in both the United States and Canada.
Because the 9005 is a single-filament design, each headlight function requires its own dedicated bulb rather than sharing a dual-filament unit between high and low beam circuits.
The P20d base is a keyed plastic base type, meaning physical orientation is fixed during installation and the bulb cannot be seated incorrectly in its socket.
The 1996 low beam position carries a notation specifying fitment with Halogen Capsule Headlamps, indicating that the 9005 low beam application on that year is conditional on that headlamp configuration.
The shared 9005 specification across both high beam and low beam positions does not indicate interchangeability between the two circuits, as each socket is wired and calibrated for its specific function within the headlamp assembly.