American Motors Marlin high beam headlight bulbs use H5001 size while low beam headlight bulbs use H5006 size. The replacement chart covers 1965 to 1967 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 American Motors Marlin used two distinct sealed beam units across its 1965-1967 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.
Both the H5001 and H5006 are sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly. Neither contains a replaceable bulb; the entire unit is replaced when the light fails.
The square profile of the H5001 and the round profile of the H5006 make the two units physically incompatible with each other, and one cannot substitute for the other in the Marlin's headlight housings.
The H5001 and H5006 fitment remained unchanged across all three model years of the Marlin, indicating no variation in headlight specification throughout the vehicle's production run.