Chevrolet Chevette Turn Signal Bulb Size

Chevrolet Chevette front and rear turn signal bulbs utilize 2057, 1157, and 1156 sizes depending on location and model variation. The replacement chart covers 1976 to 1987 production years with corresponding bulb specifications.

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

Front Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1983-1987	2057	2057	Check Price
1976-1982	1157	P21/5W	Check Price

Rear Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
1983-1987	2057	2057	Check Price
1980-1982	1157	P21/5W	Check Price
1978-1979	1156	P21W	Check Price
1977	1157	P21/5W	Check Price
1976	1156	P21W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057	Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W	Check Price

Other Locations

Additional Notes

The Chevrolet Chevette uses three bulb types across its front and rear turn signal positions: the 2057, 1157, and 1156, all of which conform to ANSI standards recognized in both the United States and Canada.
The 2057 and 1157 are dual-filament bulbs sharing the same BAY15d bayonet base, meaning they occupy the same physical socket type. The 2057 operates at 26.9W on its high-intensity filament and 8W on its low-intensity filament, while the 1157 draws 21W and 5W respectively on the same filament arrangement.
The 1156 is a single-filament bulb rated at 21W and uses a BA15s bayonet base, which is a single-contact fitting distinct from the dual-contact BAY15d base found on the 2057 and 1157. These two base types are not interchangeable.
For the Chevrolet Chevette, the front turn signal position transitioned from the 1157 to the 2057 between the 1982 and 1983 model years, with the 1157 covering 1976-1982 and the 2057 covering 1983-1987.
The rear turn signal position follows a more varied pattern. The 1156 single-filament bulb appears in the 1976, 1978, and 1979 model years, while the 1157 is specified for 1977 and 1980-1982, and the 2057 applies to 1983-1987.
Because the 2057 and 1157 share the BAY15d base, the physical socket accepts either bulb, but their wattage ratings differ. The 2057 produces a noticeably brighter high-intensity output than the 1157 due to its higher wattage on that filament.
The rear turn signal for the 1979 Chevette is specified as the 1156, a single-filament bulb, while the adjacent 1980 model year uses the dual-filament 1157. These two bulbs use different base types and are not interchangeable despite their similar wattage on the primary filament.