Chevrolet Chevy II Tail Light Bulb Size

The Chevrolet Chevy II tail light utilizes 1157 and 1034 bulb sizes for the rear illumination system. Data for the specified vehicle covers the period from 1962 through 1968.

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
1964-1968	1157
1962-1963	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 Chevy II uses two tail light bulb types across its 1962-1968 model years: the 1157 and the 1034, both classified under ANSI standards applicable to the US and Canadian markets.
The 1157 is a dual-filament bulb rated at 12V with a 21W/5W output, meaning one filament handles higher-draw functions such as braking while the second filament handles lower-draw functions such as running lights.
The 1034 shares the same dual-filament design and 12V, 21W/5W rating as the 1157 and is considered a variant of it, though the two are not necessarily interchangeable without verification.
Both the 1157 and the 1034 use a BAY15d bayonet base, a two-pin offset base type that physically locks the bulb into the socket with a twist.
The Chevrolet Chevy II (1964-1968) specifies the 1157 bulb for the tail light position across five consecutive model years.
The 1962-1963 model years specify the 1034 bulb rather than the 1157, indicating a socket or fitment difference between these earlier models and the 1964-1968 production run.
Although the 1034 and 1157 share the BAY15d base type, their status as distinct ANSI part numbers reflects differences in filament or electrical characteristics that affect direct substitution between the two.