The Buick Centurion uses H5001 bulb size for high beam headlights and H5006 bulb size for low beam headlights. The replacement chart covers vehicle production years spanning 1971 to 1973.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buick Centurion uses two distinct sealed beam headlight units across its 1971-1973 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 a filament fails, the entire unit is replaced rather than an internal bulb.
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 physical form factors of the H5001 and H5006 differ in both shape and size, making the two units non-interchangeable between the high beam and low beam positions.
The ANSI standardization of both units means that any manufacturer producing H5001 or H5006 sealed beams to that specification produces a dimensionally and electrically equivalent replacement.