The Studebaker Avanti uses 1034 bulb size for both front and rear turn signal applications. The replacement chart covers 1963 to 1964 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Studebaker Avanti uses the 1034 bulb for both front and rear turn signals across the 1963-1964 model years.
The 1034 is an ANSI-standardized bulb recognized in both the United States and Canada.
It is a dual-filament bulb, meaning it serves two lighting functions within a single housing, typically combining a higher-intensity filament for signaling with a lower-intensity filament for running or parking light duty.
The 1034 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect insertion by positioning the two pins at different heights.
The bulb operates at 12 volts with a wattage rating of 21/5W, where 21W corresponds to the brighter filament and 5W to the dimmer filament.
The 1034 is noted as a variant of the 1157, a widely used automotive bulb. While the two share the same BAY15d base and general dual-filament configuration, they are not identical, and substitution between them warrants verification of wattage and voltage compatibility for the specific application.