BMW 3.0 high beam headlight uses H5001 bulb size while low beam headlight requires H5006 bulb size. The replacement chart covers 1971 to 1974 vehicle 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 BMW 3.0 uses the H5001 bulb type for high beam headlights across the 1971-1974 model years, and the H5006 for low beam headlights across the same span.
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 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.
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 ANSI standardization of both units means that any H5001 or H5006 sealed beam produced to that specification by different manufacturers is dimensionally and electrically equivalent, allowing cross-brand substitution within the same type.