The Chevrolet Classic brake light requires a 3057 bulb size for the rear lighting system. Data for the specific component covers the period from 2004 through 2005.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Classic uses the 3057 bulb for its brake lights across the 2004-2005 model years. This bulb follows the ANSI standard recognized in both the United States and Canada.
The 3057 is a dual-filament wedge bulb with a T25 form factor, operating at 12 volts. Its two filaments are rated at 27W and 7W, which allows it to serve both a high-intensity stop function and a lower-intensity running light function within a single unit.
The center high mount stop light on the 2004-2005 Classic takes the 912 bulb, a single-filament wedge type with a T15 form factor. It operates at 12 volts and draws 12W.
The 912 is a variant of the 921 bulb. While the two share the same T15 wedge base and 12-volt operating voltage, they differ in wattage, so substituting one for the other affects light output and may not meet original equipment specifications.
Both the 3057 and 912 conform to ANSI standards applicable in the United States and Canada, meaning their electrical and physical characteristics are governed by a defined industry specification rather than a proprietary design.