Cadillac Allante front and rear turn signal bulbs utilize 2057NA and 2057 sizes respectively. The replacement chart covers 1987 through 1993 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Cadillac Allante uses the 2057NA bulb for the front turn signal across all model years from 1987-1993.
The 2057NA is a dual-filament bulb operating at 12V with a high/low wattage rating of 26.9W and 8W respectively, making it suitable for combined turn signal and parking light functions within a single housing.
The "NA" suffix on the 2057NA denotes natural amber glass, meaning the bulb produces an amber color output without relying on a colored lens to filter a clear light source.
The rear turn signal on the Cadillac Allante uses the 2057 bulb across all model years from 1987-1993, which shares the same electrical ratings and BAY15d base as the 2057NA but uses clear glass.
Both the 2057NA and 2057 are ANSI-standardized bulbs recognized in the US and Canada, and both use the BAY15d bayonet base, a two-pin offset base that prevents incorrect installation orientation.
The 2057 and 2057NA are described as brighter variants of the 1157 bulb, meaning they are not direct drop-in replacements for the 1157 despite sharing the same BAY15d base and similar wattage ratings.
Because the front position uses the 2057NA with built-in amber glass and the rear uses the clear 2057, substituting one for the other could affect the color output at either position depending on the lens color of the housing.