Toyota Mark II high beam headlight bulbs measure H5001 in size, while low beam headlight bulbs measure H5006 in size. The replacement chart covers vehicle production spanning 1972 to 1976 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 Toyota Mark II used two distinct sealed beam headlight units across its 1972-1976 model years: the H5001 for high beam and the H5006 for low beam.
Both the H5001 and H5006 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 H5001 is a 4-inch square sealed beam unit operating at 12 volts, conforming 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 12 volts and built to the same ANSI standard applicable in the United States and Canada.
The H5001 and H5006 are not interchangeable with each other. Their differing form factors, one square and one round, correspond to separate beam functions and physically distinct housings.
The high beam position on the Toyota Mark II (1972-1976) exclusively uses the H5001, while the low beam position exclusively uses the H5006, with no variation across any of the listed model years.