Plymouth Cuda front turn signal bulbs utilize 1157NA or 1034NA sizes, while rear turn signal bulbs require 1157 size specifications. The replacement chart covers 1970 through 1974 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Cuda uses three bulb types across its front and rear turn signal positions: the 1157NA, 1034NA, and 1157, all of which share the BAY15d bayonet base and dual-filament design rated at 12V with a 21W/5W output.
The BAY15d bayonet base is a double-contact offset-pin base, where the two pins are positioned at different heights to ensure correct polarity orientation during installation.
The dual-filament configuration in all three bulb types serves two functions within a single housing: the higher-wattage 21W filament operates as the turn signal, while the lower-wattage 5W filament serves as a running or parking light.
The 1157NA and 1034NA bulbs feature natural amber glass, which produces an amber-colored output without the need for an amber lens or housing filter.
The 1034NA is classified as a variant of the 1157 type, meaning the two share closely related electrical and physical characteristics, though they carry distinct ANSI designations and are not listed interchangeably in these specifications.
The front turn signal of the Plymouth Cuda uses the 1034NA for the 1971-1973 model years, while the 1974 and 1970 model years use the 1157NA instead.
The rear turn signal of the Plymouth Cuda uses the 1157 consistently across all listed model years from 1970-1974.
The 1157 used in the rear position lacks the natural amber glass of the 1157NA and 1034NA, indicating that amber coloring in the rear turn signal is provided by the lens or housing rather than the bulb itself.
All three bulb types conform to ANSI standards applicable in both the United States and Canada, reflecting a shared regulatory framework for automotive lighting in North American markets during this period.
Because the 1034NA and 1157NA are distinct ANSI-designated bulbs despite their physical and electrical similarities, substituting one for the other in the front turn signal position would fall outside the fitment data provided for the Plymouth Cuda.