The Pontiac Executive uses an H5001 bulb size for high beam headlights and an H5006 bulb size for low beam headlights. The replacement chart covers 1967 through 1970 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 Pontiac Executive used two distinct sealed beam units across its 1967-1970 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 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 square profile of the H5001 and the round profile of the H5006 make the two units physically incompatible with each other's housings, so the high beam and low beam positions do not accept the same replacement unit.
The consistent use of H5001 and H5006 across all four model years means a single replacement unit type serves the full 1967-1970 production span for each respective beam position.