White WXLL Headlight Bulb Size

White WXLL headlight bulb sizes include 9004, H6024, and H4651 for high beam applications, along with 9004, H6024, and H4656 for low beam configurations, representing the distinct bulb options available for this model. The replacement chart covers vehicle production years spanning 1986 to 1988, detailing headlight bulb specifications across that 3-year range.

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 Size
1988	9004
1988	H6024 (With Sealed Beam Headlamps)
1986-1987	9004 (Conventional)
1986-1987	H4651 (Except Conventional)

Low Beam Headlight

Years	Bulb Size
1988	9004
1988	H6024 (With Sealed Beam Headlamps)
1986-1987	9004 (Conventional)
1986-1987	H4656 (Except Conventional)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6024
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656

Other Locations

Additional Notes

The 9004 is a dual-filament halogen bulb operating at 12V with a P29t base and a 65W/45W power rating, where the higher wattage serves the high beam filament and the lower wattage serves the low beam filament. This single bulb type handles both high and low beam functions in conventional headlamp systems on the White WXLL across the 1986-1988 model years.
Because the 9004 carries both filaments within one housing, it is listed under both the High Beam and Low Beam sub-parts for each of the three model years covered. This dual-filament design is a defining characteristic of the 9004 and distinguishes it from single-filament bulbs that require separate units for each beam function.
The H6024, H4651, and H4656 are all sealed beam units rather than replaceable bulbs. In sealed beam systems, the lens, reflector, and filament are fused into a single glass unit, meaning the entire assembly is replaced rather than just an internal bulb.
The H6024 is a 7-inch round sealed beam unit operating at 12V and is listed for the 1988 White WXLL specifically in configurations equipped with sealed beam headlamps. It serves both the high and low beam positions in that configuration.
The H4651 and H4656 are both 4x6-inch rectangular sealed beam units operating at 12V. On the White WXLL for 1986-1987, the H4651 is specified for the high beam position and the H4656 for the low beam position in non-conventional headlamp configurations. Despite sharing the same physical format, these two part numbers are not interchangeable between beam positions.
All four bulb and sealed beam types listed across these specifications conform to ANSI standards applicable in both the United States and Canada, indicating compliance with North American automotive lighting regulations of the period.
The 1988 model year introduced the H6024 round sealed beam as an alternative to the rectangular H4651 and H4656 units used in 1986-1987, reflecting a difference in headlamp housing configuration between those model years rather than a change in the conventional 9004 system.