Mercury Custom headlight bulbs utilize H6024 and H6006 sizes for both high and low beam applications across the model line. The replacement chart covers 1952 through 1956 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercury Custom uses two distinct sealed beam types across its model years: the H6006 for 1952-1955 and the H6024 for 1956, with both the high beam and low beam positions sharing the same bulb type in each respective year.
The H6006 is a 5x7-inch rectangular sealed beam unit operating at 12V and conforming to ANSI standards recognized in both the United States and Canada.
The H6024 is a 7-inch round sealed beam unit, also rated at 12V and built to the same ANSI standard applicable in the United States and Canada.
Both the H6006 and H6024 are sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly; when the filament fails, the entire unit requires replacement rather than an internal bulb swap.
The H6006 and H6024 are not interchangeable due to their differing form factors, one being rectangular and the other round, which means a 1956 Mercury Custom does not accept the same headlight unit as the 1952-1955 models.
Because both the high beam and low beam positions on the Mercury Custom use the same bulb designation within a given model year, each headlight housing on these vehicles contains a single dual-filament sealed beam unit rather than separate housings for each function.