Chevrolet Corvair Turn Signal Bulb Size

Chevrolet Corvair front and rear turn signal bulbs utilize 1157 and 1034 size specifications. The replacement chart covers 1960 through 1969 production years with corresponding bulb size data.

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
1965-1969	1157	P21/5W	Check Price
1960-1964	1034	1034	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
1965-1969	1157	P21/5W	Check Price
1960-1964	1034	1034	Check Price

Bulb Specifications

Description	Type	Shop
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). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1034	Check Price

Other Locations

Additional Notes

The Chevrolet Corvair uses two distinct turn signal bulb sizes across its production run: the 1034 for 1960-1964 models and the 1157 for 1965-1969 models, with this change applying equally to both front and rear turn signal positions.
Both the 1034 and 1157 are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to defined performance and fitment standards rather than proprietary specifications.
The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and a 5W low filament, mounted on a BAY15d bayonet base. The dual-filament design allows a single bulb to serve both turn signal and parking light functions simultaneously.
The 1034 shares the same BAY15d bayonet base and 12V/21W/5W dual-filament configuration as the 1157, and is classified as a variant of it. Despite this similarity, the two types are not confirmed as interchangeable within these specifications.
The BAY15d base type features two offset pins at different heights on the base collar, a design that physically prevents incorrect single-filament bulbs from being seated in the socket.
Because the 1034 and 1157 are distinct ANSI designations, substituting one for the other without confirming socket and electrical compatibility with the specific model year of the Corvair carries a fitment risk.
The front and rear turn signal positions on the Corvair use identical bulb sizes within any given model year, so a single bulb type services all four turn signal sockets on vehicles from 1960-1964 and similarly on vehicles from 1965-1969.