GMC G1500 Headlight Bulb Size

GMC G1500 high beam and low beam headlight bulbs utilize sizes H6054, H4701, H4651 for high beam applications and H6054, H4703, H4652 for low beam applications. The replacement chart covers vehicle production years spanning 1964 to 1995.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	Bulb Type	Shop
1992-1995	H6054 (With 2 Headlamps)	Check Price
1992-1995	H4701 (With 4 Headlamps)	Check Price
1988-1991	H6054 (With 2 Headlamps)	Check Price
1988-1991	H4651 (With 4 Headlamps)	Check Price
1985-1987	H6024	Check Price
1981-1984	H6054	Check Price
1980	H6054 (With 2 Rectangular Headlamps)	Check Price
1980	H6024 (With 2 Round Headlamps)	Check Price
1979	H6054	Check Price
1966	H5001	Check Price
1964-1965	H6024 (With 2 Headlamps)	Check Price
1964-1965	H5001 (With 4 Headlamps)	Check Price

Low Beam Headlight

Years	Bulb Type	Shop
1992-1995	H6054 (With 2 Headlamps)	Check Price
1992-1995	H4703 (With 4 Headlamps)	Check Price
1990-1991	H6054 (With 2 Headlamps)	Check Price
1990-1991	H4652 (With 4 Headlamps)	Check Price
1989	H6054 (With 2 Headlamps)	Check Price
1989	H4656 (With 4 Headlamps)	Check Price
1988	H6054 (With 2 Headlamps)	Check Price
1988	H4652 (With 4 Headlamps)	Check Price
1985-1987	H6024	Check Price
1981-1984	H6054	Check Price
1980	H6054 (With 2 Rectangular Headlamps)	Check Price
1980	H6024 (With 2 Round Headlamps)	Check Price
1979	H6054	Check Price
1966	H5006	Check Price
1964-1965	H6024 (With 2 Headlamps)	Check Price
1964-1965	H5006 (With 4 Headlamps)	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054	Check Price
ANSI standard (US & Canada). 7-inch round sealed beam unit, variant. Not a replaceable bulb — the entire unit is replaced. 12V.	H4701	Check Price
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651	Check Price
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6024	Check Price
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001	Check Price
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4703	Check Price
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652	Check Price
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656	Check Price
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006	Check Price

Other Locations

Additional Notes

The H6054 sealed beam unit is the most frequently specified bulb across the GMC G1500 headlight data, appearing in both high beam and low beam positions across the 2-headlamp configuration for model years 1979-1995, as well as the 2-rectangular-headlamp variant in 1980 and the single-configuration years 1981-1984. It is a 5x7-inch rectangular sealed beam unit operating at 12V under the ANSI standard applicable to the US and Canada.
All bulb types listed in the GMC G1500 specifications are sealed beam units, meaning the entire lens, reflector, and filament assembly is replaced as one piece rather than a separate replaceable bulb being fitted into a housing. This applies uniformly across every position and model year in the data.
The H6024 is a 7-inch round sealed beam unit and serves as the specified bulb for both high and low beam in the 2-headlamp configuration for 1964-1965, the single-configuration years 1985-1987, and the 2-round-headlamp variant in 1980. It operates at 12V and conforms to the ANSI standard for the US and Canada.
The 4-headlamp configuration on the G1500 introduces beam-function separation, where distinct bulb types handle high and low beam duties independently. For 1992-1995, the H4701 handles high beam and the H4703 handles low beam, both being 7-inch round sealed beam units at 12V, though they are not interchangeable with each other due to differing beam optics.
The 4-headlamp configuration for 1988-1991 uses 4x6-inch rectangular sealed beam units rather than the 7-inch round units found in later years. The H4651 and H4652 are specified for high and low beam respectively in 1990-1991, while 1989 pairs the H4651 for high beam with the H4656 for low beam, and 1988 uses the same H4651 and H4652 pairing as 1990-1991.
The H4652 is described as a variant of the H4651, both being 4x6-inch rectangular sealed beam units at 12V. Despite their physical similarity, they serve different beam functions and are not listed as interchangeable within the specifications.
The H5001 and H5006 are specified exclusively for the 4-headlamp configurations in 1964-1966. The H5001 is a 4-inch square sealed beam unit assigned to the high beam position, while the H5006 is a 5.75-inch round sealed beam unit assigned to the low beam position. Both operate at 12V under the ANSI standard.
The 1980 model year is the only year in the specifications where two distinct headlamp configurations are differentiated by physical shape within the same headlamp count, with the 2-rectangular-headlamp variant using the H6054 and the 2-round-headlamp variant using the H6024. These two units are not interchangeable due to their differing form factors.