Chevrolet Corvette Brake Bulb Size

Additional Notes

• The Chevrolet Corvette brake light specifications span three distinct bulb families across its production history: the 1034/1154/1157 group used in earlier model years, the 2057/3057 group used in later model years, and the 1156/891 group used exclusively in the Center High Mount Stop Light position.
• The 3057 is a dual-filament wedge bulb operating at 12V with a 27W high-filament and 7W low-filament rating. Its T25 wedge base differs from the bayonet-style bases found in the other bulb types listed in these specifications, making it physically incompatible with sockets designed for bayonet-mount bulbs.
• The Chevrolet Corvette (1997-2013) uses the 3057 bulb for brake lighting, representing the longest uninterrupted single-bulb fitment in the specifications at 17 consecutive model years.
• The 2057 and 1157 share the same BAY15d bayonet base, meaning they are physically interchangeable in terms of socket fit. However, the 2057 operates at 26.9W on its high filament compared to the 1157's 21W, producing a notably brighter output. Substituting one for the other may affect brightness levels and could exceed the designed electrical load of the circuit.
• The 1034 also uses a BAY15d bayonet base and shares the same 12V, 21W/5W rating as the 1157, making the two functionally similar. Despite this, they are listed as distinct ANSI bulb types, and fitment should follow the specification for the applicable model year rather than assuming full interchangeability.
• The 1154 is rated for both 6V and 12V operation, distinguishing it from all other bulbs in these specifications, which are rated exclusively at 12V. This dual-voltage rating reflects the electrical system standards of the era in which it was used.
• The Center High Mount Stop Light on the Corvette (1990-1996) uses the 1156, a single-filament bulb with a BA15s bayonet base rated at 12V and 21W. The BA15s base is not interchangeable with the BAY15d base used by the 2057, 1157, and 1034 bulbs, as the two base types differ in pin offset geometry.
• The 891 is a single-filament halogen bulb with a PGJ13 base, rated at 12V and 27W. Its halogen construction and PGJ13 base make it physically and electrically distinct from all other bulbs in these specifications, and it is not cross-compatible with any of the bayonet or wedge-base types listed.
• The Center High Mount Stop Light position transitioned from the 891 halogen bulb (1986-1989) to the 1156 incandescent bulb (1990-1996), representing a change in both bulb technology and base type within the same lamp position across those model years.
• All bulb types in these specifications conform to ANSI standards applicable in the United States and Canada, indicating that the sizing designations follow a standardized North American classification system rather than the ECE (European) numbering conventions used in other markets.