Oldsmobile Toronado Headlight Bulb Size

The Oldsmobile Toronado headlight bulb sizes include H4701, H4651, H5001 for high beam applications and H4703, H4656, H4652 for low beam applications, with each bulb size corresponding to specific vehicle configurations. The replacement chart covers 1966 through 1992 production years and details the bulb specifications for each model year.

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
1986-1992	H4701	Check Price
1976-1985	H4651	Check Price
1966-1975	H5001	Check Price

Low Beam Headlight

Years	Bulb Type	Shop
1986-1992	H4703	Check Price
1982-1985	H4656	Check Price
1981	H4652	Check Price
1978-1980	H4656	Check Price
1976-1977	H4652	Check Price
1966-1975	H5006	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). 7-inch round sealed beam unit, variant. Not a replaceable bulb — the entire unit is replaced. 12V.	H4701	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). 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.	H4703	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). 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). 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

All headlight bulb sizes listed for the Oldsmobile Toronado across its full model range are sealed beam units, meaning the entire lens-reflector-filament assembly is replaced as one piece rather than a separate bulb being swapped within a housing.
Every sealed beam type in these specifications operates at 12 volts and conforms to ANSI standards recognized in both the United States and Canada.
The H5001 high beam and H5006 low beam are the two sealed beam types used on the 1966-1975 Toronado. The H5001 is a 4-inch square unit, while the H5006 is a 5.75-inch round unit, making the two physically incompatible with each other despite serving the same vehicle.
The 1976-1985 Toronado high beam position uses the H4651, a 4x6-inch rectangular sealed beam unit. Its low beam counterpart varies across those same years, with the H4656 and the H4652 both appearing. The H4652 is a variant of the H4651 and shares the same 4x6-inch rectangular form factor, though the specifications treat them as distinct part numbers.
The H4652 low beam appears specifically for the 1976-1977 and 1981 Toronado model years, while the H4656 fills the low beam position for 1978-1980 and 1982-1985. Both occupy the same 4x6-inch rectangular housing format, so the distinction between them is one of filament or photometric specification rather than physical size.
The 1986-1992 Toronado uses the H4701 for the high beam and the H4703 for the low beam. Both are 7-inch round sealed beam units, with the H4701 noted as a variant of the standard 7-inch round form. The two are not interchangeable between beam positions despite sharing the same round housing format.
Three distinct physical formats appear across the full Toronado headlight history: 4-inch square (H5001), 5.75-inch round (H5006), and 4x6-inch rectangular (H4651, H4652, H4656), followed by 7-inch round (H4701, H4703). A unit from one format group cannot be substituted into a housing designed for another.
The low beam specifications for the 1981 Toronado list the H4652, which differs from the H4656 used in the immediately surrounding years of 1980 and 1982-1985, indicating that year-specific verification is necessary even within what otherwise appears to be a continuous production period.