Chevrolet G-Van Headlight Bulb Size

Additional Notes

• The Chevrolet G-Van uses sealed beam headlight units across all listed model years from 1975 to 1995. Sealed beam units integrate the filament, reflector, and lens into a single assembly, meaning the entire unit is replaced rather than an individual bulb. All types specified operate at 12V and conform to ANSI standards applicable in the United States and Canada.
• The H6054 is a 5x7-inch rectangular sealed beam unit and is the most consistently specified bulb across the G-Van lineup. It serves as both the high beam and low beam on 2-headlamp rectangular configurations from 1978 to 1995, functioning as a dual-beam unit within a single assembly.
• The H6024 is a 7-inch round sealed beam unit specified for G-Van models equipped with 2 round headlamps from 1978 to 1987, and as the sole headlight type for the 1975-1977 model years. Like the H6054, it handles both high and low beam functions in those configurations.
• On the Chevrolet G-Van, the headlamp system type, whether 2-lamp or 4-lamp, and whether round or rectangular, directly determines which bulb size is required. Substituting a bulb from a different configuration is not supported by these specifications, as each system uses physically distinct sealed beam units that are not interchangeable with one another.
• 4-headlamp configurations on the G-Van use separate sealed beam units for high and low beams, unlike the 2-headlamp setups where one unit covers both functions. In 4-lamp systems, the high beam and low beam positions each receive a dedicated unit with a distinct part number.
• The 4x6-inch rectangular sealed beam units, H4651, H4652, and H4656, are specified exclusively for 4-headlamp G-Van configurations. H4651 and H4652 share the same physical format, with H4652 noted as a variant of H4651, while H4656 is a separate 4x6-inch unit used in the low beam position for 1988-1989 model years.
• The 7-inch round sealed beam units used in 4-headlamp configurations, H4701 and H4703, are distinct from the H6024 despite sharing the same round format and nominal size. H4701 is designated for the high beam position and H4703 for the low beam position in 4-lamp setups on 1992-1995 models, and neither is interchangeable with the H6024 used in 2-lamp round systems.
• The low beam unit for 4-headlamp G-Van models changed across production years. H4656 was specified for 1988-1989, H4652 replaced it for 1990-1991, and H4703 was used from 1992 to 1995. Each of these units occupies the same low beam position but carries a different part designation, indicating they are not direct substitutes for one another.