Oldsmobile Cutlass Headlight Bulb Size

Oldsmobile Cutlass high beam headlight bulbs utilize 9005, H4651, and H6054 sizes, while low beam headlight bulbs use 9006, H4652, and H4656 sizes across multiple generations. The replacement chart covers 1961 through 1999 production years with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1997-1999	9005	HB3	Check Price
1980-1981	H4651	H4651	Check Price
1978-1979	H6054	H6054	Check Price
1976-1977	H4651	H4651	Check Price
1974-1975	H6024	H6024	Check Price
1961-1973	H5001	H5001	Check Price

Low Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1997-1999	9006	HB4	Check Price
1981	H4652	H4652	Check Price
1980	H4656	H4656	Check Price
1978-1979	H6054	H6054	Check Price
1976-1977	H4652	H4652	Check Price
1974-1975	H6024	H6024	Check Price
1961-1973	H5006	H5006	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament halogen bulb with P20d base. 12V, 65W.	9005	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). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054	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). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001	Check Price
ANSI standard (US & Canada). Single-filament halogen bulb with P22d base. 12V, 55W.	9006	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
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 are the most frequently specified bulb types across the Oldsmobile Cutlass headlight data, covering high beam and low beam positions respectively for model years 1961-1972. Both are ANSI-standard 12V sealed beam units, meaning the entire lens-reflector-filament assembly is replaced as one piece rather than swapping an individual bulb.
The H5001 is a 4-inch square sealed beam unit used in the high beam position, while the H5006 is a 5.75-inch round sealed beam unit used in the low beam position. Despite serving the same generation of the Cutlass, these two units are not interchangeable due to their differing shapes and sizes.
For 1973-1974, the Cutlass shifted to the H6024, a 7-inch round sealed beam unit for both high and low beam positions. This round format differs physically from the square H5001 and round H5006 units used in prior years, making cross-year substitution between these formats incompatible.
The H6054, a 5x7-inch rectangular sealed beam unit, was specified for both the high beam and low beam positions in 1978-1979. Its rectangular form factor is distinct from the round H6024 and the 4x6-inch H4651 and H4652 units used in adjacent model years, so fitment is not shared across those years.
In 1980, the low beam position used the H4656, a 4x6-inch rectangular sealed beam unit, while the high beam used the H4651. In 1981, the low beam changed to the H4652, which is a variant of the H4651. Although H4651 and H4652 share the same 4x6-inch rectangular form, they are distinct part numbers and are not confirmed as direct substitutes for one another.
Starting with the 1997-1999 Cutlass, the headlight system moved away from sealed beam units entirely. The 9005 replaced sealed beams in the high beam position and the 9006 in the low beam position. Both are single-filament halogen bulbs with separate replaceable capsules, unlike every earlier sealed beam type listed in the specifications.
The 9005 operates at 12V and 65W with a P20d base, while the 9006 operates at 12V and 55W with a P22d base. Although both are single-filament halogen bulbs of similar physical scale, their base types differ, making them non-interchangeable between the high and low beam sockets.
All bulb types listed across the full span of Cutlass headlight specifications conform to ANSI standards applicable in the United States and Canada, meaning each sealed beam unit and each halogen capsule follows a standardized size and electrical specification within that regulatory framework.