The Oldsmobile Regency brake light requires a 2057 bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 1997 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile Regency uses two distinct bulb types across its brake lighting system for the 1997-1998 model years: the 2057 for standard brake lights and the 1156 for the center high mount stop light.
The 2057 is a dual-filament bulb operating at 12V with a wattage split of 26.9W for the high-intensity filament and 8W for the low-intensity filament, making it suitable for combined stop and tail light functions.
The 2057 uses a BAY15d bayonet base, which is an offset-pin base designed to prevent incorrect installation by ensuring the bulb can only be seated in one orientation.
The 2057 is classified as a brighter variant of the 1157, meaning the two share the same dual-filament, BAY15d base configuration but differ in output levels and are not directly interchangeable without accounting for that difference.
The 1156 is a single-filament bulb rated at 12V and 21W, dedicated solely to the center high mount stop light, which operates only as a stop signal with no secondary tail light function.
The 1156 uses a BA15s bayonet base, which is a single-pin base distinct from the offset dual-pin BAY15d base of the 2057, making the two bulbs physically incompatible with each other's sockets.
Both the 2057 and 1156 conform to ANSI standards recognized in the United States and Canada, indicating standardized dimensional and electrical specifications across manufacturers.
The brake light positions on the Oldsmobile Regency for 1997-1998 require the 2057, while the center high mount stop light position requires the 1156, and substituting one for the other is not supported by the fitment specifications.