The White WIL features front and rear turn signal bulbs in 1157 and 2057 sizes. The replacement chart covers 1984 through 1988 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The White WIL uses two bulb types across its front and rear turn signal positions: the 1157 for the 1988 model year and the 2057 for the 1984-1987 model years.
Both the 1157 and 2057 are ANSI-standardized bulbs recognized in the United States and Canada, operating on a 12-volt electrical system.
Each bulb type carries a dual-filament design, meaning a single bulb serves two brightness levels within the same housing, typically one filament for steady running light duty and one for the higher-intensity turn signal flash.
Both bulb types share the BAY15d bayonet base, a two-pin offset base that physically locks the bulb into the socket at a fixed rotational position to align the filaments correctly.
The 1157 is rated at 21W for its high-intensity filament and 5W for its low-intensity filament, while the 2057 is rated at 26.9W and 8W respectively, making the 2057 the higher-wattage variant of the two.
Because the 1157 and 2057 share the same BAY15d base, they are physically interchangeable in the socket, but the wattage difference means the two types are not electrically equivalent replacements for one another.
The front and rear turn signal positions on the White WIL use identical bulb sizes for each given model year, so the same bulb type applies to both positions simultaneously.
The 1988 White WIL represents a shift from the 2057 used in prior years to the lower-wattage 1157 in both the front and rear turn signal positions.