Chevrolet Corvair Trunk Bulb Size

The Chevrolet Corvair trunk light requires a 1003 bulb size for proper illumination within the storage compartment. Available information covers the specific time range from 1960 through 1969.

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 Type	Shop
1960-1969	1003	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003	Check Price

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Additional Notes

The 1003 is the trunk bulb size specified for the Chevrolet Corvair across all listed model years, spanning 1960-1969.
The 1003 bulb follows the ANSI standard, meaning it conforms to a defined North American specification recognized in both the United States and Canada.
This bulb operates on a 12-volt electrical system, which is consistent with the standard automotive electrical architecture used in passenger vehicles of this era.
At 21 watts, the 1003 produces a moderate light output suitable for an interior illumination application such as a trunk compartment.
The 1003 uses a single-filament design, meaning it serves one lighting function only, with no secondary filament for a reduced-intensity mode.
The BA15s bayonet base is a single-contact bayonet fitting, and the "s" designation indicates the contact pin is centered, distinguishing it from offset-pin variants that are not interchangeable with this socket type.
Because the BA15s base is a specific contact configuration, substituting a bulb with a BA15d (dual-contact) base would result in an incompatible fit even though the physical shell size may appear similar.