The White WCS front and rear turn signal bulbs utilize 1157 and 2057 sizes. A replacement chart documents bulb specifications across the 1981 to 1988 production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The White WCS uses two bulb types across its front and rear turn signal positions: the 1157 and the 2057, both of which are ANSI-standardized for the US and Canadian markets.
The 2057 is the dominant fitment for the White WCS, appearing in both the front and rear turn signal positions for model years 1981-1987.
For the 1988 White WCS, both the front and rear turn signal positions shifted to the 1157 bulb, departing from the 2057 used in prior years.
Both the 1157 and 2057 are dual-filament bulbs, meaning each serves two lighting functions within a single housing, typically combining a higher-wattage turn signal filament with a lower-wattage running or parking light filament.
Both bulb types share the BAY15d bayonet base, a two-pin offset base design that physically locks the bulb into the socket and ensures correct filament orientation.
The 1157 operates at 12V with filament ratings of 21W and 5W, while the 2057 operates at 12V with filament ratings of 26.9W and 8W, making the 2057 the higher-output variant of the two.
Because the 1157 and 2057 share the same BAY15d base, they are physically interchangeable in the socket, though their wattage outputs differ and the intended fitment by year should be observed.