The Oldsmobile Delmont 88 headlight bulb sizes consist of H5001 for high beam and H5006 for low beam configurations. The replacement chart covers 1967 to 1968 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 Oldsmobile Delmont 88 uses two distinct sealed beam types across its headlight system for the 1967-1968 model years: the H5001 for high beam and the H5006 for low beam.
The H5001 is a 4-inch square sealed beam unit operating at 12V. It conforms 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 12V and built to the same ANSI standard applicable in the United States and Canada.
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 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 are not interchangeable.
The H5001 and H5006 specifications remain unchanged across both the 1967 and 1968 model years of the Delmont 88, indicating no variation in headlight bulb requirements between those two years.