Chevrolet Celebrity Brake Bulb Size

Additional Notes

• The 2057 bulb is the most frequently specified type across the Chevrolet Celebrity brake light positions, appearing in the standard brake light application for model years 1983-1990, with the exception of 1982.
• The 2057 is a dual-filament bulb rated at 12V with a high/low wattage split of 26.9W and 8W, and it uses a BAY15d bayonet base, the same base type found on the 1157 it replaces in higher-output applications.
• The 1157, specified for the 1982 Chevrolet Celebrity, shares the BAY15d bayonet base with the 2057 but operates at a lower wattage of 21W and 5W across its two filaments, making the two bulbs physically interchangeable at the socket level despite differing output ratings.
• Because the 2057 and 1157 share the BAY15d base, a 1157 socket will physically accept a 2057 bulb, though the output levels differ between the two types.
• The Center High Mount Stop Light position uses two distinct bulb types depending on the model year, with the 1156 specified for 1986-1988 and the 212-2 specified for 1990.
• The 212-2 is a festoon-style bulb with an SV8.5 base, rated at 12V and 12W, and its 41mm length is a defining fitment factor that distinguishes it from the other bulb types listed in these specifications.
• The 1156 is a single-filament bulb rated at 12V and 21W, using a BA15s bayonet base, which is not interchangeable with the BAY15d base used by the 2057 and 1157 despite a similar physical appearance.
• The shift from the 1156 to the 212-2 in the Center High Mount Stop Light position between 1988 and 1990 reflects a change in socket and housing design, as the two bulb types use entirely different base configurations.