Oldsmobile Cutlass Calais Headlight Bulb Size

The Oldsmobile Cutlass Calais uses high beam headlight bulbs in 9004, H4651, and H6054 sizes, while low beam headlight bulbs are available in 9004, H4652, and H4656 sizes. The replacement chart covers 1978 through 1991 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

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
1988-1991	9004	HB1	Check Price
1980-1984	H4651	H4651	Check Price
1978-1979	H6054	H6054	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
1988-1991	9004	HB1	Check Price
1981-1984	H4652	H4652	Check Price
1980	H4656	H4656	Check Price
1978-1979	H6054	H6054	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament halogen bulb with P29t base. 12V, 65W/45W.	9004	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). 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 Oldsmobile Cutlass Calais uses three distinct headlight technologies across its model years: sealed beam units in earlier years and a dual-filament halogen bulb in later years.
The 9004 bulb, used in the 1988-1991 Cutlass Calais for both high and low beam functions, is a dual-filament halogen type with a P29t base rated at 12V and 65W on high beam and 45W on low beam. A single bulb handles both beam functions in one housing.
The H4651 and H4652 sealed beam units, used from 1980-1984, are both 4x6-inch rectangular ANSI-standard units operating at 12V. The H4651 serves the high beam position while the H4652 serves the low beam position, meaning the two positions require different part numbers despite sharing the same physical size.
The H6054 sealed beam unit, used in 1978-1979, is a 5x7-inch rectangular ANSI-standard unit rated at 12V. It serves both the high and low beam positions in those years, requiring only one part number for both functions.
The H4656, used exclusively for the low beam position in 1980, is a 4x6-inch rectangular sealed beam unit. It differs from the H4652 used in 1981-1984 despite occupying the same position, so the two are not interchangeable.
All sealed beam types, including the H4651, H4652, H4656, and H6054, are not bulb-replaceable units. The entire sealed assembly is replaced when the light fails, rather than an internal filament or capsule.
The shift from sealed beam units to the 9004 halogen bulb between the 1984 and 1988 model years represents a change in the replacement method, from whole-unit sealed beams to a serviceable bulb within a retained housing.
All bulb and sealed beam types specified for the Cutlass Calais conform to ANSI standards applicable in both the United States and Canada.