White WHL Headlight Bulb Size

The White WHL headlight bulb size chart specifies high beam and low beam bulb options including 9004, H6024, H4651, and H4656 sizes for this model. The replacement chart covers 1981 through 1988 vehicle 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.

High Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1988	9004 (With Composite Headlamps)	HB1	Check Price
1988	H6024 (With Sealed Beam Headlamps)	H6024	Check Price
1981-1987	9004 (Conventional)	HB1	Check Price
1981-1987	H4651 (Except Conventional)	H4651	Check Price

Low Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1988	9004 (With Composite Headlamps)	HB1	Check Price
1988	H6024 (With Sealed Beam Headlamps)	H6024	Check Price
1981-1987	9004 (Conventional)	HB1	Check Price
1981-1987	H4656 (Except Conventional)	H4656	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004	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). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651	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

Other Locations

Additional Notes

The 9004 is a dual-filament halogen bulb rated at 12V with a 65W high beam filament and a 45W low beam filament, fitted with a P29t base. Because it carries both filaments in a single unit, the 9004 serves both the high beam and low beam positions on the White WHL across all listed model years where the conventional headlamp configuration is specified.
The White WHL (1981-1987) required the 9004 bulb for conventional headlamp configurations and sealed beam units for non-conventional configurations, meaning the headlamp system type determines which bulb applies rather than the model year alone.
The H4651 and H4656 are both 4x6-inch rectangular sealed beam units operating at 12V under the ANSI standard applicable in the US and Canada. The H4651 is specified for the high beam position and the H4656 for the low beam position in non-conventional configurations on the 1981-1987 WHL, making the two units non-interchangeable despite their shared physical format.
Sealed beam units such as the H4651, H4656, and H6024 are not replaceable bulbs in the conventional sense. When one fails, the entire sealed unit is replaced rather than an internal filament or capsule.
The H6024 is a 7-inch round sealed beam unit rated at 12V. It appears exclusively in the 1988 model year specifications for vehicles equipped with sealed beam headlamps, covering both the high beam and low beam positions.
The 1988 model year introduced composite headlamp configurations to the WHL specification, with the 9004 bulb designated for both beam positions in that setup. This contrasts with the sealed beam H6024 units specified for the same year under the sealed beam headlamp configuration, and the two systems are not interchangeable.
All bulb types listed across the WHL specifications conform to ANSI standards recognized in both the US and Canada, indicating compliance with North American automotive lighting regulations for the applicable production period.