Plymouth Fury III Back Up Light Bulb Size

The Plymouth Fury III back up light utilizes bulb sizes 1156 and 1073 along with the unique P21W specification for various lighting applications. Data for the provided bulb sizes covers the range from 1965 to 1974.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1970-1974	1156
1969	1073
1965-1968	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	1073

Other Locations

Additional Notes

The Plymouth Fury III back up light specifications cover the 1965-1974 model years, with bulb size data recorded for each year across this ten-year span.
The 1156 bulb is the dominant fitment across these specifications, appearing in nine of the ten model years listed, specifically 1965-1968 and 1970-1974.
The 1156 is an ANSI-standard single-filament bulb rated at 12 volts and 21 watts, mounted on a BA15s bayonet base, a single-contact base design that locks into the socket with a twist.
The 1073 bulb is specified exclusively for the 1969 Plymouth Fury III, making it the sole departure from the otherwise consistent 1156 fitment across this generation.
The 1073 shares the same ANSI-standard single-filament construction and BA15s bayonet base as the 1156, operating at 12 volts but rated at a lower 13 watts.
Although the 1073 and 1156 share the same base type, their wattage ratings differ by 8 watts, which reflects a meaningful difference in electrical draw and light output between the two bulbs.
The physical compatibility of the BA15s base between the 1073 and 1156 does not make them interchangeable for the 1969 model, as the differing wattage ratings indicate the socket and circuit were specified for the lower-output bulb that year.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating they were designed for the North American automotive market.