White WHM Turn Signal Bulb Size

The White WHM front and rear turn signal bulbs both require a 2057 bulb size. The replacement chart covers vehicle production spanning 1981 to 1987.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Turn Signal

Years	Bulb Size
1984-1987	2057 (Except Conventional)
1981	2057 (Except Conventional)

Years	Bulb Size
1984-1987	2057 (Except Conventional)
1981	2057 (Except Conventional)

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057

The 2057 bulb is the sole bulb type specified for the White WHM across both front and rear turn signal positions.
The 2057 is an ANSI-standard bulb recognized in both the United States and Canada, operating at 12 volts with a dual-filament configuration rated at 26.9 watts on the high filament and 8 watts on the low filament.
The 2057 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect insertion by positioning its two pins at different heights.
The 2057 is a brighter variant of the 1157 bulb, meaning the two types share a similar form factor but are not identical in output, and substitution between them warrants attention to wattage differences.
The front turn signal specification for the White WHM applies to model years 1981 and 1984-1987, all calling for the 2057 bulb with the Except Conventional restriction.
The rear turn signal specification mirrors the front exactly, with the same years and the same Except Conventional fitment condition.
The Except Conventional notation indicates that the 2057 fitment applies only to non-conventional cab configurations of the White WHM, and conventional variants fall outside this specification.