The Buick Special headlight bulb size chart documents high beam and low beam bulb specifications including H5001, H6024, H6006, and H5006 sizes. The replacement chart covers vehicle production years spanning 1950 to 1969.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Buick Special headlight specifications span model years 1950-1969, with three distinct sealed beam bulb types used across high beam and low beam positions over that period: H6006, H6024, H5001, and H5006.
All four bulb types listed are ANSI-standardized sealed beam units rated at 12V. In a sealed beam design, the lens, reflector, and filament are fused into a single glass unit, meaning the entire assembly is replaced rather than an internal bulb.
The H5001 is a 4-inch square sealed beam unit used exclusively in the high beam position on the Buick Special for model years 1958-1969. Its square form factor is physically distinct from the round and rectangular units used in other positions and years.
The H5006 is a 5.75-inch round sealed beam unit assigned to the low beam position for the same 1958-1969 range. Because the H5001 and H5006 differ in both shape and size, they are not interchangeable with each other despite serving the same vehicle in the same years.
Model years 1954-1957 used the H6024, a 7-inch round sealed beam unit, for both high beam and low beam positions. A single bulb type serving both functions indicates a dual-filament sealed beam design, where one unit contains separate filaments for each lighting mode.
Model years 1950-1953 used the H6006, a 5x7-inch rectangular sealed beam unit, also for both high and low beam positions, again pointing to a dual-filament configuration within a single sealed unit.
The shift from rectangular H6006 units (1950-1953) to round H6024 units (1954-1957) and then to separate H5001 and H5006 units (1958-1969) reflects changes in headlight system architecture across the production run of the Buick Special.
Because all units are ANSI-standardized, fitment is governed by the physical form factor of each bulb type. Substituting a unit of a different size or shape would not conform to the housing geometry specified for each model year.