Buick GS 400 Turn Signal Bulb Size

The Buick GS 400 front turn signal requires a 1157NA bulb size while the rear turn signal uses a 1157 bulb size. The replacement chart covers 1968 to 1969 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.

Front Turn Signal

YearsUS TypeEU TypeShop
1968-19691157NAP21/5WCheck Price

Rear Turn Signal

YearsUS TypeEU TypeShop
1968-19691157P21/5WCheck Price

Bulb Specifications

Description Type Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 21W/5W.1157NACheck Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.P21/5WCheck Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.1157Check Price

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