The Plymouth PB300 front turn signal bulb accommodates 1157, 1157NA, and 1034NA sizes, while the rear turn signal bulb uses 1157 or 198 sizes. The replacement chart covers vehicle production data spanning 1975 to 1980.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth PB300 front turn signal uses four distinct bulb sizes across the 1975-1980 model years: 1157, 1157NA, 1034NA, and 198.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W high filament and a 5W low filament, conforming to ANSI standards for the US and Canadian markets.
The 1157NA shares the same BAY15d bayonet base, dual-filament configuration, and 12V/21W/5W rating as the 1157, but features natural amber glass rather than clear glass.
The 1034NA is a variant of the 1157, carrying the same BAY15d bayonet base and 12V/21W/5W rating, and also incorporates natural amber glass.
The 198 is a miniature wedge bulb of the T5 type, rated at 12V and 2W, representing a significantly lower wattage than the dual-filament bulbs used elsewhere in the PB300 turn signal system.
The Plymouth PB300 front turn signal for 1979-1980 uses the clear-glass 1157, while the 1978 and 1976 model years use the amber-glass 1157NA, and 1977 uses the amber-glass 1034NA variant.
The rear turn signal on the Plymouth PB300 uses the 198 miniature wedge bulb for 1975-1978, while 1979-1980 use the dual-filament 1157.
The 1157 and 1157NA are physically interchangeable due to their shared BAY15d bayonet base, but substituting a clear 1157 for an 1157NA in positions specified for amber output would alter the color of the turn signal light without an external amber lens.
The 198 wedge bulb is not interchangeable with the 1157, 1157NA, or 1034NA, as it uses a wedge base rather than a bayonet base and operates at a substantially lower wattage.
All bulb types listed for the Plymouth PB300 turn signals conform to ANSI standards applicable to both the United States and Canada.