Plymouth Belvedere II front and rear turn signal bulbs utilize 1034NA and 1034 sizes respectively. The replacement chart contains bulb specifications covering 1965 through 1967 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Belvedere II uses the 1034NA for the front turn signal across the 1965-1967 model years, while the 1034 serves the rear turn signal across the same span.
Both the 1034 and 1034NA are ANSI-standardized bulbs recognized in the United States and Canada, each operating at 12 volts with a dual-filament rating of 21/5 watts.
The dual-filament design of both bulbs allows a single unit to serve two lighting functions, typically a brighter filament for the turn signal and a dimmer one for a running or parking light.
Both bulbs share the BAY15d bayonet base, a two-pin offset base that physically prevents incorrect insertion by positioning the pins at different heights around the base.
The 1034 and 1034NA are each classified as variants of the 1157, meaning they share the same base type and general electrical characteristics while differing in glass treatment.
The distinguishing feature of the 1034NA over the 1034 is its natural amber glass envelope, which produces an amber-colored output without requiring an amber-tinted lens on the vehicle.
Because the 1034NA produces its amber color through the glass itself, substituting a clear 1034 in a front housing designed for the 1034NA could alter the visible signal color at the lens.
The shared BAY15d base between the 1034 and 1034NA means the two bulbs are physically interchangeable at the socket level, though the amber glass of the 1034NA makes them functionally distinct in applications where lens color is a factor.