Oldsmobile Starfire Headlight Bulb Size

The Oldsmobile Starfire high beam headlight bulb sizes include H4651, H5001, and H6024, while low beam headlight bulb sizes comprise H4656, H4652, and H5006 in varying configurations. The replacement chart covers vehicle production years spanning 1954 to 1980 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
1975-1980	H4651
1961-1966	H5001
1954-1957	H6024

Low Beam Headlight

Years	Bulb Size
1978-1980	H4656
1976-1977	H4652
1975	H4656
1961-1966	H5006
1954-1957	H6024

Bulb Specifications

Description	Bulb Size
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). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001
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.	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
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006

Other Locations

Additional Notes

All headlight bulb sizes listed for the Oldsmobile Starfire across all model years are sealed beam units, meaning the entire housing assembly is replaced rather than an internal filament or capsule.
Every sealed beam type in these specifications operates at 12V and conforms to ANSI standards recognized in both the United States and Canada.
The H4651 and H4656 are both 4x6-inch rectangular sealed beam units used across the 1975-1980 model years, with H4651 serving the high beam position and H4656 serving the low beam position in most of those years.
The H4652, a variant of the H4651, was fitted to the low beam position on the Oldsmobile Starfire for the 1976-1977 model years, replacing the H4656 used in adjacent years for that same position.
The 1961-1966 model years used a 4-inch square sealed beam unit (H5001) for high beam and a 5.75-inch round sealed beam unit (H5006) for low beam, representing a distinct fitment pairing from other production periods.
The H6024 is a 7-inch round sealed beam unit and is the only type in these specifications where the same bulb size fills both the high beam and low beam positions, as seen on the 1954-1957 model years.
The rectangular 4x6-inch format (H4651, H4652, H4656) and the square 4-inch format (H5001) are not interchangeable due to differences in physical form factor, despite sharing the same 12V operating voltage.
The H5006 at 5.75 inches round and the H6024 at 7 inches round are similarly incompatible with each other and with the rectangular units, as sealed beam housings are designed to accept only the specific form factor for which the vehicle's headlight cavity was built.