GMC PM251 Turn Signal Bulb Size

The GMC PM251 front and rear turn signal bulbs utilize 1073 and 1034 size bulbs for proper illumination. The replacement chart covers 1956 to 1957 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

YearsBulb TypeShop
19571073Check Price
19561034Check Price

Rear Turn Signal

YearsBulb TypeShop
19571073Check Price
19561034Check Price

Bulb Specifications

Description Type Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.1073Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.1034Check Price

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