GMC G35 high beam and low beam headlight bulbs utilize H6024 and H5001 sizes for high beam applications, with H6024 and H5006 sizes for low beam configurations. The replacement chart covers 1970 through 1978 production 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 GMC G35 headlight specifications cover the 1970-1978 model years, with two distinct sealed beam configurations used across that span depending on the year.
The H6024 is a 7-inch round sealed beam unit operating at 12V and conforming to ANSI standards for the US and Canada. It serves as both the high beam and low beam headlight on the G35 for the 1973-1978 model years, meaning a single bulb type handles both functions in a dual-beam arrangement.
All three bulb types found in these specifications are sealed beam units, meaning the lens, reflector, and filament are fused into one assembly. When the filament fails, the entire unit requires replacement rather than just an internal bulb.
For the 1970-1972 model years, the G35 uses a split configuration: the H5001 for high beam and the H5006 for low beam. These are two physically distinct sealed beam units with different sizes and functions.
The H5001 is a 4-inch square sealed beam unit rated at 12V and built to ANSI standards. Its square form factor distinguishes it physically from the round units used elsewhere in these specifications.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12V and ANSI-compliant. It is dedicated solely to the low beam function on the 1970-1972 G35.
The H5001 and H5006 are not interchangeable with each other or with the H6024, as each carries a distinct size, shape, and designated beam function within the headlight system.
The transition from the split H5001/H5006 pairing to the single H6024 type occurred between the 1972 and 1973 model years, reflecting a change in headlight housing design across that boundary.