Mercury Bobcat headlight bulbs utilize H6054 and H6024 sizes for both high beam and low beam applications. The replacement chart covers 1975 through 1980 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 Bobcat uses two distinct sealed beam headlight units across its 1975-1980 model years: the H6024 for 1975-1978 and the H6054 for 1979-1980.
The H6024 is a 7-inch round sealed beam unit operating at 12V and conforming to ANSI standards recognized in both the United States and Canada.
The H6054 is a 5x7-inch rectangular sealed beam unit, also rated at 12V and built to the same ANSI standard applicable in the United States and Canada.
Both the H6024 and H6054 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.
On the Mercury Bobcat, the same bulb size serves both the high beam and low beam functions for every model year listed, indicating that each headlight unit handles dual-beam output within a single sealed assembly.
The H6024 and H6054 are not interchangeable. Their differing form factors, one round and one rectangular, correspond to different headlight housings, and substituting one for the other is not supported by the fitment data.