The Pontiac Vibe brake light utilizes a 7443 bulb size for illumination across all listed vehicle applications. Data for the specific component covers the period from 2003 through 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Vibe uses the 7443 bulb for its brake lights across the 2003-2008 model years.
The 7443 is a dual-filament wedge bulb in the T20 form factor, rated at 12V with a wattage split of 21W for the high-intensity filament and 5W for the low-intensity filament. This dual-filament design allows a single bulb to serve both brake and tail light functions.
The 7443 conforms to the ANSI standard applicable in the United States and Canada.
The Center High Mount Stop Light on the Pontiac Vibe uses the 921 bulb across the 2003-2008 model years.
The 921 is a single-filament wedge bulb in the T15 form factor, rated at 12V and 16W. Its single-filament construction means it operates only in an on or off state, without a secondary low-intensity mode.
The 921 also conforms to the ANSI standard for the United States and Canada.
The 7443 and 921 are physically distinct bulb types with different form factors, T20 and T15 respectively, and are not interchangeable with each other despite both being wedge-base designs.
The wattage difference between the 7443 brake filament at 21W and the 921 at 16W reflects their separate roles, with the higher-wattage 7443 filament producing greater light output for the primary brake signal at the rear.