Dodge D450 Headlight Bulb Size

The Dodge D450 high beam headlight uses bulb sizes H6054, H6024, or H4651, while low beam headlight applications require H6054, H6024, or H4656 bulb sizes. The replacement chart covers 1978 to 1981 model 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
1981	H6054
1979-1980	H6024 (With 2 Headlamps)
1979-1980	H4651 (With 4 Headlamps)
1978	H6024

Low Beam Headlight

Years	Bulb Size
1981	H6054
1980	H6024 (With 2 Headlamps)
1980	H4656 (With 4 Headlamps)
1979	H6024 (With 2 Headlamps)
1979	H4652 (With 4 Headlamps)
1978	H6024

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054
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
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652

Other Locations

Additional Notes

The Dodge D450 headlight specifications for 1978-1981 exclusively use sealed beam units, meaning the entire lamp assembly is replaced rather than an individual bulb when the light fails.
All sealed beam types listed across the 1978-1981 model years operate on 12V and conform to ANSI standards recognized in both the United States and Canada.
The H6054 is a 5x7-inch rectangular sealed beam unit and serves as both the high beam and low beam headlight on the 1981 D450, making it a dual-function fitment where a single unit type covers both positions.
The H6024 is a 7-inch round sealed beam unit and appears across the 1978-1980 model years, making it the most frequently recurring bulb type in these specifications.
On the Dodge D450, the 1979-1980 model years offered two distinct headlamp configurations: a 2-headlamp system using the H6024 round unit, and a 4-headlamp system using smaller 4x6-inch rectangular sealed beam units.
Within the 4-headlamp configuration, the high beam and low beam positions use different sealed beam types. The H4651 handles the high beam while the H4656 handles the low beam in 1980, and the H4651 handles the high beam while the H4652 handles the low beam in 1979. These units are not interchangeable between positions despite sharing the same 4x6-inch rectangular form.
The H4652 is described as a variant of the H4651. Both share the same 4x6-inch rectangular sealed beam format, but they serve different beam functions and should not be substituted for one another.