The Chevrolet SSR front turn signal requires a 7443 bulb size while the rear turn signal uses a 3157 bulb size. Replacement chart data covers 2003 through 2006 model years for this vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet SSR uses the 7443 bulb for the front turn signal across all production years, 2003-2006.
The 7443 is a dual-filament wedge bulb classified under the T20 form factor, rated at 12V with a 21W/5W filament configuration.
The higher 21W filament in the 7443 serves the active turn signal function, while the lower 5W filament supports a secondary lighting role such as parking or daytime running light operation.
The rear turn signal on the Chevrolet SSR uses the 3157 bulb for all model years, 2003-2006.
The 3157 is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W/7W filament configuration.
The T25 housing of the 3157 is physically larger than the T20 housing of the 7443, making the two bulbs non-interchangeable despite both being dual-filament wedge types.
Both the 7443 and 3157 conform to ANSI standards applicable in the United States and Canada.
The 3157 carries a higher wattage output than the 7443, with its primary filament rated at 27W compared to the 7443's 21W.