Lincoln Mark VII high and low beam headlight bulbs both utilize a 9004 size bulb. The replacement chart covers vehicle production spanning 1984 to 1992.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lincoln Mark VII uses the 9004 bulb size for both high beam and low beam headlights across all model years from 1984-1992.
The 9004 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 65W for high beam output and one rated at 45W for low beam output.
Because the 9004 handles both beam functions within one bulb, the high beam and low beam headlight positions on the Mark VII share the same bulb specification rather than requiring separate bulb types for each function.
The 9004 operates on a 12V electrical system, which is standard for passenger vehicles of this type.
The 9004 uses a P29t base, which is a specific connector and mounting configuration. A bulb with a different base type is not physically interchangeable with the 9004 socket, regardless of other similarities in voltage or wattage.
The 9004 meets ANSI standards and is recognized for use in both the United States and Canada, reflecting a standardized specification shared across North American markets.