Pontiac Grand Prix Headlight Bulb Size

Additional Notes

• The 9007 bulb is the most widely used type across the Pontiac Grand Prix headlight specifications, serving as both the high beam and low beam source in a single unit for the 1997-2003 model years. It is a dual-filament halogen bulb with a PX29t base, rated at 12V and drawing 65W on high beam and 55W on low beam. Its dual-filament design allows one bulb to handle both functions, which is a distinct characteristic compared to single-filament types.
• The 9005 and 9006 are single-filament halogen bulbs used together as a split high/low beam arrangement. The 9005 carries a P20d base at 12V and 65W for high beam duty, while the 9006 uses a P22d base at 12V and 55W for low beam. This pairing appears in the 2004 model year and also in the halogen capsule headlamp configuration for the 1988-1996 model years.
• For the 1991-1996 Pontiac Grand Prix, headlamp type determines the correct bulb entirely. Vehicles equipped with halogen capsule headlamps use replaceable 9005/9006 bulbs, while those fitted with sealed beam headlamps require H4351 (high beam) and H4352 (low beam) units. These two configurations are not interchangeable, and substituting one type for the other is not possible without modifying the headlamp housing.
• Sealed beam units, which appear throughout the earlier model year specifications, are not serviceable in the same way as modern halogen capsule bulbs. Types such as H4351, H4352, H4651, H4652, H4656, H5001, H5006, and H6024 are complete lens-and-filament assemblies that must be replaced as a whole unit rather than by swapping an internal bulb.
• The H4651 and H4652 are both 4x6-inch rectangular sealed beam units, with H4652 serving as a variant of H4651 in a low beam role. The Grand Prix used H4651 for high beam across the 1976-1987 model years, while low beam fitment varied between H4652 and H4656 depending on the specific year, making year-by-year verification necessary for that era.
• The H6024 is a 7-inch round sealed beam unit used for both high and low beam positions on the 1971-1975 Grand Prix. At that size, it is among the larger sealed beam formats in these specifications. Because the same part number covers both beam positions in those years, the H6024 is a dual-function unit within a multi-lamp headlamp system.
• The 1962-1970 Grand Prix used 4-inch square sealed beam units, with H5001 designated for high beam and H5006 for low beam. The H5006 is a 5.75-inch round sealed beam unit, which means the high and low beam positions in that era used physically different sealed beam formats and are not interchangeable with each other.
• All bulb and sealed beam types listed across these specifications conform to ANSI standards applicable in the United States and Canada, and all operate on a 12V electrical system. This standardization means that ANSI-compliant replacement units from various manufacturers are generally compatible, provided the specific type designation matches exactly.