Chevrolet Corvair Brake Bulb Size

The Chevrolet Corvair brake components utilize 1157 and 1034 bulb sizes for the lighting systems. Available information covers the production span from 1960 through 1969 for the specified vehicle.

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

Bulb Size by Year Range

Years	Bulb Size
1965-1969	1157
1960-1964	1034

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1034

Other Locations

Additional Notes

The Chevrolet Corvair uses two distinct brake bulb sizes across its production run, with the 1034 fitted to the 1960-1964 model years and the 1157 fitted to the 1965-1969 model years.
Both the 1034 and 1157 are ANSI-standardized bulbs recognized in the United States and Canada, and both operate on a 12-volt electrical system with a dual-filament configuration rated at 21W and 5W respectively.
The dual-filament design of both bulb types allows a single housing to serve two brightness levels, with the higher 21W filament typically active during braking and the lower 5W filament serving as a running or parking light.
Both bulb types share the BAY15d bayonet base, a two-pin offset base that physically locks the bulb into the socket and ensures correct filament orientation within the housing.
The 1034 is a variant of the 1157, meaning the two share the same base type and general construction but differ in filament output characteristics, which makes them non-interchangeable despite their physical similarities.
Because the 1034 and 1157 use the same BAY15d base, the socket itself does not prevent substitution, so the distinction between the two must be observed by bulb number rather than by fit alone.