Plymouth Plaza front and rear turn signal bulbs utilize 1034 or 1154 size specifications. The replacement chart covers vehicle production spanning 1954 to 1958.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Plaza uses two bulb types across its front and rear turn signal positions: the 1034 and the 1154, both of which are dual-filament bulbs sharing the BAY15d bayonet base.
The 1034 bulb is an ANSI-standardized type rated at 12V with a 21/5W dual-filament output, where the higher wattage filament serves the turn signal function and the lower wattage filament serves a secondary purpose such as running or parking light duty.
The 1154 bulb is an older ANSI-standardized type compatible with both 6V and 12V electrical systems, reflecting the transitional period in automotive electrics during the mid-1950s when manufacturers were shifting from 6-volt to 12-volt platforms.
Both the 1034 and 1154 are described as variants of the widely known 1157 bulb, meaning they share the same BAY15d base configuration but differ in voltage rating and filament wattage.
For the Plymouth Plaza, the 1956-1958 model years use the 1034 bulb in both the front and rear turn signal positions.
The 1954-1955 model years of the Plymouth Plaza use the 1154 bulb in both the front and rear turn signal positions, consistent with the older 6V-compatible electrical systems of that era.
The front and rear turn signal bulb specifications are identical for every model year listed, meaning the Plaza does not use different bulb types between its front and rear turn signal housings in any given year.
Although the 1034 and 1154 share the same BAY15d bayonet base, substituting one for the other is not straightforward due to differences in voltage rating, which makes electrical system compatibility a critical factor in fitment decisions for the Plymouth Plaza.