Plymouth PB100 License Plate Bulb Size

The Plymouth PB100 license plate light uses bulb size 1155 or 97 depending on the specific application. Data for the bulb sizes covers the range from 1975 to 1980.

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
1980	1155
1975-1979	97

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	1155
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97

Other Locations

Additional Notes

The bulb 97 is the license plate bulb for the Plymouth PB100 across the 1975-1979 model years, while the 1980 model year uses the 1155 bulb instead.
Both the 97 and 1155 are ANSI-standardized bulbs recognized in the United States and Canada, each operating on a 12-volt system with a single filament and a BA15s bayonet base.
The BA15s bayonet base is a single-contact bayonet fitting, which physically distinguishes it from dual-contact variants and determines socket compatibility.
Although the 97 and 1155 share the same BA15s base type, they differ in wattage. The 97 draws 13 watts, while the 1155 draws 21 watts, making them non-interchangeable despite their physical similarities.
Both bulbs are described as variants of the 1156, a widely used automotive bulb, which indicates a shared base design within that family but not identical electrical ratings.
The wattage difference between the 97 and the 1155 is relevant to socket and circuit compatibility, as a higher-wattage bulb draws more current than the circuit may have been designed to handle in a given model year.