Mercury LN7 high beam and low beam headlight bulbs both utilize the H6054 bulb size. The replacement chart covers vehicle production spanning 1982 to 1983.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V. It conforms to ANSI standards recognized in both the United States and Canada.
Unlike halogen or HID bulb types, the H6054 is not a replaceable bulb in the conventional sense. When the unit fails, the entire sealed beam assembly is replaced rather than an internal filament or capsule.
The Mercury LN7 uses the H6054 for both high beam and low beam headlight positions across the 1982-1983 model years, meaning a single bulb type serves all four headlight functions on the vehicle.
The shared H6054 fitment across both beam positions is a characteristic of older sealed beam headlight systems, where separate high and low beam filaments are housed within the same sealed unit rather than in distinct housings.
Because the H6054 follows an ANSI-standardized form factor, units from different manufacturers are generally interchangeable as long as they carry the same designation, provided the electrical rating of 12V is matched.