Mercury Montclair Headlight Bulb Size

Mercury Montclair high beam and low beam headlight bulbs utilize H5001, H6024, H6006, and H5006 sizes depending on the specific bulb configuration and model variant. The replacement chart covers 1955 to 1968 production years with corresponding bulb size specifications for each generation.

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
1964-1968	H5001	Check Price
1957-1960	H5001	Check Price
1956	H6024	Check Price
1955	H6006	Check Price

Low Beam Headlight

Years	Bulb Type	Shop
1964-1968	H5006	Check Price
1957-1960	H5006	Check Price
1956	H6024	Check Price
1955	H6006	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001	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). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6006	Check Price
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006	Check Price

Other Locations

Additional Notes

The H5001 and H5006 sealed beam units appear as a paired high beam and low beam combination across the Mercury Montclair for model years 1957-1960 and 1964-1968, reflecting a dual-headlamp system in which each function is handled by a separate sealed unit.
The H5001 is a 4-inch square sealed beam unit operating at 12V and conforming to ANSI standards applicable in both the United States and Canada. As a sealed beam design, the entire unit is replaced rather than an internal filament or bulb element.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12V and built to the same ANSI standard. It serves as the low beam counterpart to the H5001 in the dual-headlamp configuration used across the majority of Montclair model years listed.
The 1956 Mercury Montclair used the H6024 for both high beam and low beam positions. The H6024 is a 7-inch round sealed beam unit rated at 12V, a format associated with single-headlamp systems where one unit per side handles the full lighting function.
The 1955 Mercury Montclair used the H6006 for both high beam and low beam positions. The H6006 is a 5x7-inch rectangular sealed beam unit rated at 12V, also structured as a single-unit-per-side system.
Because the 1955 and 1956 model years each use a single bulb size for both beam functions, while 1957-1960 and 1964-1968 use two distinct sizes, the headlamp systems across these years are not interchangeable with one another.
All four bulb types listed in the specifications, H5001, H5006, H6024, and H6006, are sealed beam units. None accept replaceable internal bulbs, meaning the optical assembly, reflector, and light source are fused into a single sealed component.
All bulb types across all listed model years operate at 12V and conform to ANSI standards recognized in both the United States and Canada, indicating a consistent electrical compatibility across the full range of Montclair years covered in the specifications.