The GMC PM150 high beam and low beam headlight bulbs utilize H6024 and H6006 bulb sizes for this model. The replacement chart covers vehicle production years spanning 1953 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 H6024 and H6006 are both 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 just the bulb element.
The H6024 is a 7-inch round sealed beam unit operating at 12V, conforming to ANSI standards recognized in both the United States and Canada.
The H6006 is a 5x7-inch rectangular sealed beam unit also rated at 12V and held to the same ANSI standard as the H6024.
The GMC PM150 used the H6024 for both high beam and low beam functions in 1956-1957, indicating a single sealed beam unit served dual lighting roles in those years.
The 1953 and 1955 model years of the PM150 used the H6006 for both high beam and low beam positions, following the same dual-function sealed beam arrangement as the later H6024 fitment.
The round H6024 and the rectangular H6006 are not interchangeable. Their differing form factors and mounting configurations are specific to the headlight housings of their respective model years.
The shift from the H6006 to the H6024 between 1955 and 1956 represents a change in both the shape and physical size of the sealed beam unit, which affects housing compatibility.