The White WIL features front side marker bulbs in 1157 and 194 sizes, with rear side marker bulbs in 194 size. The replacement chart covers 1984 to 1988 model 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 194 bulb is the most frequently specified size across the White WIL side marker positions, appearing in both the front and rear side marker roles for the 1984-1987 model years, as well as the rear side marker position for 1988.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and is recognized under both US and Canadian standards.
The 1157 is specified exclusively for the front side marker position on the 1988 White WIL, making it the sole year and position where this bulb type is required in the front.
The 1157 is an ANSI-standard dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W filament configuration, and is also recognized under both US and Canadian standards.
The dual-filament design of the 1157 means it carries two separate filaments within a single envelope, each operating at a different wattage, which is a functionally distinct characteristic from the single-filament 194.
The BAY15d bayonet base of the 1157 and the wedge base of the 194 are physically incompatible mounting types, meaning the two bulbs are not interchangeable regardless of voltage similarity.
The front side marker position on the 1988 White WIL requires the 1157, while the same position on the 1984-1987 models requires the 194, indicating a direct fitment difference between the 1988 model year and the preceding four years for that specific position.
The rear side marker position uses the 194 across all listed model years, from 1984 through 1988, without variation.