Oldsmobile Firenza Headlight Bulb Size

The Oldsmobile Firenza high beam headlight bulb size includes 9005, H4651, and H6054 options, while low beam headlight bulb size encompasses 9006, H4652, and H4656 options. The replacement chart covers vehicle production years spanning 1982 to 1988 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	9005	HB3	Check Price
1983-1987	H4651	H4651	Check Price
1982	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	9006	HB4	Check Price
1986-1987	H4652	H4652	Check Price
1984-1985	H4656	H4656	Check Price
1983	H4652	H4652	Check Price
1982	H6054	H6054	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). 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

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Additional Notes

The 1982 Oldsmobile Firenza uses the H6054 sealed beam unit for both high and low beam positions, making it the only model year in these specifications where a single bulb type serves both functions.
The H6054 is a 5x7-inch rectangular sealed beam unit rated at 12V. As a sealed beam design, the entire unit is replaced rather than an internal filament or capsule.
The H4651 and H4652 are both 4x6-inch rectangular sealed beam units operating at 12V. They share the same physical housing format but are distinct part numbers, with H4652 classified as a variant of H4651.
Because H4651 and H4652 are separate designations despite their shared format, substituting one for the other without confirming compatibility is not supported by these specifications.
The 1983 and 1985-1986 model years differ in their low beam assignment despite sharing the same high beam bulb. The 1983 Firenza uses H4652 for low beam, while the 1985-1986 models use H4656, a separate 4x6-inch sealed beam unit.
The 1988 Firenza departs from the sealed beam format used in all prior years, with the high beam position switching to the 9005 and the low beam position switching to the 9006. Both are single-filament halogen bulbs with replaceable capsules rather than sealed beam units.
The 9005 operates at 12V and 65W with a P20d base, while the 9006 operates at 12V and 55W with a P22d base. Although the two bulbs are physically similar, their base types differ, and they are not interchangeable between the high and low beam positions.
All bulb types listed across these specifications conform to ANSI standards applicable in both the United States and Canada.