GMC F350 high and low beam headlight bulbs utilize H6024 and H6006 size specifications for optimal illumination. The replacement chart covers 1953 through 1957 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC F350 uses two sealed beam unit types across its 1953-1957 model years: the H6024 and the H6006. Both conform to ANSI standards recognized in the United States and Canada and operate on a 12V electrical system.
The H6006 is a 5x7-inch rectangular sealed beam unit. This format was specified for the 1953-1955 model years across both the high beam and low beam headlight positions.
The H6024 is a 7-inch round sealed beam unit. This format was specified for the 1956-1957 model years across both the high beam and low beam headlight positions.
In both the H6024 and H6006 designs, the lens, reflector, and filament are permanently fused into a single housing. When the filament fails, the entire unit requires replacement rather than an internal bulb swap.
The high beam and low beam positions share the same bulb type within each model year on the GMC F350. A single sealed beam unit serves both functions through separate filaments contained within the same housing.
The shift from the H6006 to the H6024 between the 1955 and 1956 model years represents a change in both the physical shape and the size of the sealed beam unit. These two types are not interchangeable due to their differing form factors.