Chevrolet Classic Headlight Bulb Size

Chevrolet Classic headlight bulbs utilize 9005 size for high beam and 9006 size for low beam applications. The replacement chart covers 2004 to 2005 model 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

Years	US Type	EU Type	Shop
2004-2005	9005	HB3	Check Price

Low Beam Headlight

Years	US Type	EU Type	Shop
2004-2005	9006	HB4	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). Single-filament halogen bulb with P22d base. 12V, 55W.	9006	Check Price

Other Locations

Additional Notes

The Chevrolet Classic uses the 9005 bulb for high beam headlights across both the 2004-2005 model years, and the 9006 bulb for low beam headlights across the same span.
Both the 9005 and 9006 are ANSI-standardized halogen bulb types recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical specifications rather than being proprietary fitments.
Each bulb type carries a single filament, which is typical of halogen bulbs dedicated to a single lighting function, as opposed to dual-filament designs that serve two functions within one housing.
The 9005 operates at 12 volts and 65 watts, while the 9006 operates at 12 volts and 55 watts. The higher wattage of the 9005 corresponds to its high beam role, where greater light output is required.
The 9005 uses a P20d base and the 9006 uses a P22d base. These two base types are physically distinct, which means the bulbs are not interchangeable despite their otherwise similar construction.
Although the 9005 and 9006 share the same voltage rating and halogen technology, substituting one for the other is not possible due to the differing base configurations and wattage ratings.