The Buick Invicta front turn signal requires a 1034NA or 1034 bulb size, while the rear turn signal uses a 1034 bulb size. The replacement chart covers 1959 through 1963 model 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 1034 bulb is an ANSI-standard dual-filament bulb operating at 12 volts with a 21/5-watt output and a BAY15d bayonet base. It is classified as a variant of the widely used 1157 bulb type.
The BAY15d bayonet base features two offset pins at different heights, which physically prevents incorrect insertion and ensures correct filament alignment within the socket.
The dual-filament design of the 1034 allows a single bulb to serve two functions simultaneously, typically a brighter filament for the turn signal and a dimmer filament for a running or parking light.
The 1034NA carries the same electrical ratings and BAY15d base as the standard 1034 but is distinguished by its natural amber glass envelope, which produces amber light without relying on a colored lens.
The Buick Invicta uses the 1034 for the front turn signal across the 1959-1962 model years, while the 1963 model year specifies the 1034NA for that same position.
Because the 1034NA and 1034 share identical voltage, wattage, and base specifications, the substitution of one for the other is electrically compatible, though the amber tint of the 1034NA affects the color output when used with a clear lens.
The rear turn signal of the Buick Invicta uses the 1034 across all listed model years, 1959-1963, with no variant substitution at that position.
The 1034 and 1034NA are both governed by ANSI standards applicable in the United States and Canada, meaning their physical and electrical tolerances conform to a defined specification rather than being manufacturer-specific.