Pontiac GTO Headlight Bulb Size

Pontiac GTO headlight bulb sizes include H9, H6024, and H5001 for high beam applications, along with H11, H6024, and H5006 for low beam configurations across multiple generations of this model. The replacement chart covers 1964 through 2006 production years with corresponding bulb size specifications for each vehicle generation.

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 Size
2004-2006	H9
1973	H6024
1964-1972	H5001

Low Beam Headlight

Years	Bulb Size
2004-2006	H11
1973	H6024
1964-1972	H5006

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-5 base. Also approved in the US. 12V, 65W.	H9
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6024
ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5001
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-2 base. Also approved in the US. 12V, 55W.	H11
ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H5006

Other Locations

Additional Notes

The Pontiac GTO uses four distinct bulb types across its headlight specifications: H9, H11, H6024, H5001, and H5006. Three of these are sealed beam units governed by ANSI standards, while H9 and H11 are replaceable halogen bulbs governed by ECE standards.
The H5001 is a 4-inch square sealed beam unit rated at 12V and serves as the high beam headlight across the 1964-1972 GTO. As a sealed beam design, the entire unit is replaced rather than an internal bulb.
The H5006 is a 5.75-inch round sealed beam unit rated at 12V and covers the low beam headlight position for the same 1964-1972 model years. It is similarly a full-unit replacement rather than a serviceable bulb.
The 1973 Pontiac GTO uses the H6024 for both high and low beam positions. The H6024 is a 7-inch round sealed beam unit rated at 12V, and its use in both positions means a single sealed beam type handles the full headlight system that year.
For the 2004-2006 GTO, the high beam headlight uses the H9 bulb, a single-filament halogen type with a PGJ19-5 base rated at 12V and 65W. It originates from the ECE standard but carries US approval as well.
The low beam headlight on the 2004-2006 GTO uses the H11, a single-filament halogen bulb with a PGJ19-2 base rated at 12V and 55W. Although H9 and H11 are both single-filament ECE halogen types, their base configurations differ and the two are not interchangeable with each other.
The shift from sealed beam units in earlier model years to discrete replaceable halogen bulbs in the 2004-2006 GTO reflects a fundamental difference in headlight construction. Sealed beam units integrate the lens, reflector, and filament into one assembly, while the H9 and H11 are standalone bulbs seated within a separate housing.
Because the H5001 and H5006 are separate sealed beam units serving different beam functions, they are not interchangeable with each other despite both being ANSI-standard sealed beam types used on the same vehicle in the same model years.