Nissan D21 Headlight Bulb Size

Nissan D21 headlight bulbs utilize 9004 and H6054 sizes for both high and low beam applications. The replacement chart covers 1986 to 1994 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.

High Beam Headlight

Years	Bulb Size
1986-1994	9004 (With Halogen Capsule Headlamps)
1986-1994	H6054 (With Sealed Beam Headlamps)

Low Beam Headlight

Years	Bulb Size
1986-1994	9004 (With Halogen Capsule Headlamps)
1986-1994	H6054 (With Sealed Beam Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054

Other Locations

Additional Notes

The Nissan D21 used two distinct headlamp system types across the 1986-1994 model years: halogen capsule headlamps and sealed beam headlamps. Each system requires a different bulb or unit, and the two are not interchangeable.
The 9004 is a dual-filament halogen bulb operating at 12V with a wattage rating of 65W on high beam and 45W on low beam. Its single P29t base serves both filaments, which is why one bulb covers both the high beam and low beam positions in halogen capsule-equipped D21 models.
The 9004 bulb conforms to the ANSI standard applicable in the United States and Canada, meaning it meets a defined specification for base type, wattage, and light output rather than being a proprietary design.
The H6054 is a 5x7-inch rectangular sealed beam unit rated at 12V. Unlike the 9004, it is not a replaceable bulb housed within a separate housing. The entire sealed beam unit functions as both the lens and the light source, so the whole assembly is replaced when the unit fails.
The H6054 also conforms to the ANSI standard for the US and Canadian market. Its rectangular form factor is a standardized size, which means units from different manufacturers sharing the H6054 designation are physically compatible with the same mounting positions.
Because the 9004 and H6054 serve the same high beam and low beam functions on the Nissan D21, the correct replacement depends entirely on which headlamp system the specific vehicle was built with. Installing a 9004 bulb into a sealed beam housing, or vice versa, is not a valid substitution.
Both headlamp system types remained consistent across all documented model years from 1986 to 1994, with no variation in bulb size specification from year to year within either system type.