Cadillac Series 60 Fleetwood Headlight Bulb Size

The Cadillac Series 60 Fleetwood headlight bulb specifications include high beam sizes H5001, H6024, and H6006, along with low beam sizes H5006, H6024, and H6006 in varying bulb configurations. The replacement chart covers vehicle production years spanning 1950 to 1964 with corresponding bulb size data.

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
1958-1964	H5001	Check Price
1953-1957	H6024	Check Price
1950-1952	H6006	Check Price

Low Beam Headlight

Years	Bulb Type	Shop
1958-1964	H5006	Check Price
1953-1957	H6024	Check Price
1950-1952	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

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Additional Notes

The Cadillac Series 60 Fleetwood headlight specifications across 1950-1964 reference four sealed beam unit types: H5001, H5006, H6006, and H6024. All four conform to ANSI standards applicable in the United States and Canada and operate on 12V electrical systems.
All four bulb types are sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly. When the filament fails, the entire unit requires replacement rather than an internal bulb swap.
The H6024 is a 7-inch round sealed beam unit. In the Cadillac Series 60 Fleetwood, it served as both the high beam and low beam headlight from 1953-1957, functioning as a single unit per side in a dual-purpose role.
From 1958-1964, the high beam and low beam functions were separated into two distinct sealed beam types. The H5001, a 4-inch square unit, handled high beam duty, while the H5006, a 5.75-inch round unit, handled low beam duty.
The H6006 is a 5x7-inch rectangular sealed beam unit that served both high beam and low beam positions on the 1950-1952 Cadillac Series 60 Fleetwood, identical to the H6024's dual-purpose role in later years.
The H5001 and H5006 are not interchangeable despite both being used simultaneously on the same vehicle from 1958-1964. Their physical formats differ, with the H5001 being square and the H5006 being round, making cross-substitution physically incompatible.
The H6006 and H6024 share the same dual high/low beam role across different model years but differ in physical format, rectangular versus round, and are not interchangeable with each other or with the later H5001 and H5006 units.
The transition from single sealed beam units to separate high and low beam assemblies occurred between the 1957 and 1958 model years, reflecting a shift in headlight system architecture that required two different sealed beam types per headlight position.