Mercury Caliente headlight bulbs utilize H5001 size for high beam and H5006 size for low beam applications. The replacement chart covers 1964 to 1967 model 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 Caliente uses two distinct sealed beam units across its 1964-1967 model years: the H5001 for high beam and the H5006 for low beam.
The H5001 is a 4-inch square sealed beam unit operating at 12V. It conforms to ANSI standards recognized in both the United States and Canada.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12V and built to the same ANSI standard applicable in the United States and Canada.
Neither the H5001 nor the H5006 contains a replaceable bulb element. When either unit fails, the entire sealed assembly requires replacement rather than an internal component swap.
The square profile of the H5001 and the round profile of the H5006 make the two units physically incompatible with each other's housings, so substitution between the high beam and low beam positions is not possible.
Both units share the same 12V electrical rating, meaning the voltage requirement is consistent across the high beam and low beam circuits on the Caliente for all four model years covered.