The White WHL features front side marker bulbs in 1157 and 194 sizes, with rear side marker bulbs in 194 size. The replacement chart covers vehicle production years spanning 1981 to 1988 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 WHL uses two bulb types across its side marker positions: the 194 and the 1157, both of which are ANSI-standardized for the US and Canadian markets.
The 194 is a miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and it serves as the dominant bulb type across both front and rear side marker positions on the White WHL.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W filament configuration. Its dual-filament design distinguishes it functionally from the single-filament 194.
For the 1988 White WHL, the front side marker position specifies the 1157, while the rear side marker position specifies the 194, meaning the two positions on that model year are not interchangeable with a single bulb type.
The 194 wedge base and the 1157 BAY15d bayonet base are physically incompatible socket types, so the two bulbs cannot be substituted for one another regardless of voltage compatibility.
The front side marker on the White WHL carries an "Except Conventional" fitment condition for model years 1981-1987, indicating that the 194 specification does not apply to the Conventional body configuration during those years.
The rear side marker on the White WHL carries the same "Except Conventional" fitment condition for model years 1981-1987, applying the same body-type restriction to that position as well.
The 1988 rear side marker specifies the 194 without any fitment condition, distinguishing it from the 1981-1987 rear side marker entries where the Conventional exclusion is present.