GMC General high beam headlight bulbs utilize H5001 or H6024 size, while low beam headlight bulbs use H5006 or H6024 size. The replacement chart covers 1984 through 1988 model 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 H5001, H6024, and H5006 bulbs listed across these specifications are all sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly. When the filament fails, the entire unit is replaced rather than an internal bulb.
All three sealed beam types operate at 12 volts and conform to ANSI standards recognized in both the United States and Canada.
The H5001 is a 4-inch square sealed beam unit used exclusively for high beam positions in these specifications. The H5006 is a 5.75-inch round sealed beam unit and serves exclusively as the low beam counterpart to the H5001 in four-headlamp and Tiltmaster configurations.
The H6024 is a 7-inch round sealed beam unit that functions as both the high beam and low beam in two-headlamp configurations. In a two-headlamp system, a single unit per side handles both beam functions, which is why one part number covers both roles.
The GMC General with a two-headlamp system uses H6024 units for both high and low beam positions during the 1985-1987 model years, while four-headlamp and Tiltmaster configurations use H5001 for high beam and H5006 for low beam across those same years.
The 1984 and 1988 model years list only Tiltmaster fitment data, specifying H5001 for high beam and H5006 for low beam in both years.
The H5001 and H5006 are not interchangeable with each other or with the H6024, as each has a distinct physical size and shape. Substituting one sealed beam type for another would result in an incorrect fit within the headlamp housing.
Four-headlamp systems separate high and low beam functions into dedicated units, which is why two distinct part numbers, H5001 and H5006, are required, whereas the two-headlamp system consolidates both functions into the single H6024 unit per side.