The White WIM front and rear turn signal bulbs utilize 1157 and 2057 size specifications. The replacement chart covers 1984 through 1988 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The White WIM 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 at 12 volts with a dual-filament design.
The dual-filament construction in both bulb types allows a single housing to serve two distinct functions, typically a high-intensity filament for active signaling and a lower-intensity filament for a running or parking light role.
Both bulb types share the BAY15d bayonet base, a two-pin offset base that physically locks the bulb into its socket and ensures correct filament orientation.
The 1157 carries wattage ratings of 21W and 5W across its two filaments, while the 2057 carries 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 differing wattage outputs mean they are not electrically equivalent replacements for one another.
The front and rear turn signal positions on the White WIM use identical bulb specifications for each model year, meaning the same bulb type applies to both positions in a given year.