The White WHS front and rear turn signal bulbs utilize 1157 and 2057 sizes. The replacement chart covers 1981 to 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 two bulb types specified across the White WHS turn signal positions are the 1157 and 2057, both of which are ANSI-standard dual-filament bulbs rated at 12 volts and sharing the BAY15d bayonet base.
The 1157 carries a wattage rating of 21W on its high-filament and 5W on its low-filament, while the 2057 draws 26.9W and 8W respectively, making the 2057 the higher-output of the two types.
Although both bulbs share the BAY15d bayonet base, the 2057 is a brighter variant of the 1157 and the two are not identical in output, which is a relevant fitment consideration when sourcing replacements.
For the White WHS, the 1988 model year uses the 1157 in both the front and rear turn signal positions.
The 2057 bulb is specified for both the front and rear turn signal positions across the 1981-1987 model years, with the qualifier "Except Conventional" applied uniformly to all of those entries.
The "Except Conventional" qualifier on the 1981-1987 entries indicates that the 2057 fitment applies only to non-conventional body configurations of the White WHS, and those vehicles require separate verification before a replacement bulb is selected.