The GMC PM152 high beam and low beam headlight bulbs utilize H6024 and H6006 bulb sizes for this model. The replacement chart covers vehicle production years spanning 1952 to 1957 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 H6006 is a 5x7-inch rectangular sealed beam unit operating at 12V, conforming to ANSI standards recognized in both the United States and Canada. Because it is a sealed beam design, the entire unit is replaced rather than an internal filament or capsule.
The H6024 is a 7-inch round sealed beam unit, also rated at 12V and built to the same ANSI standard. Like the H6006, the whole assembly is replaced when the unit fails.
The GMC PM152 uses the H6006 for both high beam and low beam headlights across the 1952-1955 model years, meaning a single bulb type serves both lighting functions in those years.
The 1957 GMC PM152 uses the H6024 for both high beam and low beam positions, representing a shift from the rectangular H6006 format to a round sealed beam unit.
Because the H6006 and H6024 differ in shape and physical size, the two types are not interchangeable. Substituting one for the other is not supported by the fitment data.
Sealed beam technology integrates the reflector, lens, and filament into a single glass envelope. This construction means that any damage to the lens or reflector requires full unit replacement, as no internal component is serviceable separately.