Plymouth Trailduster Headlight Bulb Size

Plymouth Trailduster high beam and low beam headlight bulbs utilize H6054, H4651, H6024, H4652, and H4656 bulb sizes across different model configurations. The replacement chart covers 1974 through 1981 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 Type	Shop
1981	H6054	Check Price
1979-1980	H4651	Check Price
1974-1978	H6024	Check Price

Low Beam Headlight

Years	Bulb Type	Shop
1981	H6054	Check Price
1980	H4652	Check Price
1979	H4656	Check Price
1974-1978	H6024	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054	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). 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, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V.	H4652	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 H6024 is the most frequently specified bulb type across the Plymouth Trailduster's headlight history, covering both high beam and low beam positions for the 1974-1978 model years. It is a 7-inch round sealed beam unit built to ANSI standards for the US and Canadian markets, operating at 12V. As a sealed beam design, the entire unit is replaced rather than an internal bulb.
For the 1981 Plymouth Trailduster, both the high beam and low beam positions share the same bulb type, the H6054. This is a 5x7-inch rectangular sealed beam unit conforming to ANSI standards, rated at 12V. The shared fitment across both beam positions in that year is a distinct characteristic not present in any other model year covered by these specifications.
The 1980 model year marks a transition from the round H6024 format to 4x6-inch rectangular sealed beam units, with the high beam using the H4651 and the low beam using the H4652. The H4652 is a variant of the H4651, and while both share the same physical format and ANSI classification, they are not the same part and serve different beam functions.
The 1979 Plymouth Trailduster uses the H4651 for the high beam and the H4656 for the low beam. Both are 4x6-inch rectangular sealed beam units operating at 12V, but they carry different ANSI designations and are not interchangeable between positions.
All bulb types specified for the Plymouth Trailduster across all listed years are sealed beam units. None of them use a replaceable internal bulb; the entire sealed assembly is the serviceable component in each case.
The rectangular sealed beam types used in 1979-1981, specifically the H4651, H4652, H4656, and H6054, represent a physically different format from the round H6024 used in 1974-1978. The round and rectangular formats are not interchangeable, as the mounting and housing configurations differ between the two designs.
All five bulb types referenced in these specifications conform to ANSI standards applicable in both the United States and Canada, and all are rated at 12V, consistent with standard automotive electrical systems of that era.
Within the 4x6-inch rectangular sealed beam family, the H4651, H4652, and H4656 are distinct ANSI designations assigned to specific beam functions. Substituting one for another across high and low beam positions would not conform to the fitment specifications listed for the Trailduster.