The Chevrolet Townsman high beam headlight uses an H5001 bulb size while the low beam headlight requires an H5006 bulb size. The replacement chart covers 1969 through 1972 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 Chevrolet Townsman uses the H5001 for high beam headlights and the H5006 for low beam headlights across the 1969-1972 model years.
Both the H5001 and H5006 are sealed beam units, meaning the lens, reflector, and filament are fused into a single housing. When a filament fails, the entire unit requires replacement rather than an internal bulb swap.
The H5001 is a 4-inch square sealed beam unit conforming to ANSI standards recognized in both the United States and Canada, operating at 12 volts.
The H5006 is a 5.75-inch round sealed beam unit, also built to ANSI standards for the US and Canadian markets, and likewise rated at 12 volts.
Because the H5001 and H5006 differ in both shape and size, the two units are not interchangeable. The high beam position requires the square 4-inch H5001, while the low beam position requires the round 5.75-inch H5006.
The shared ANSI standardization of both units means that any H5001 or H5006 sealed beam produced to that specification is dimensionally and electrically equivalent, regardless of manufacturer.