Dodge Royal Monaco License Plate Bulb Size

The Dodge Royal Monaco license plate light requires 97 or 168 bulb sizes depending on the specific configuration of the vehicle. Data for the bulb sizes covers the range from 1975 to 1977.

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
1977	97
1975-1976	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The 1977 Dodge Royal Monaco uses a type 97 bulb for the license plate position, while the 1975-1976 model years use a type 168 bulb, meaning the two generations of this vehicle are not interchangeable in this application.
The type 97 is an ANSI-standardized single-filament bulb rated at 12V and 13W, fitted with a BA15s bayonet base, and is classified as a variant of the more widely known 1156 bulb family.
The BA15s designation on the type 97 refers to a single-contact bayonet base with a 15mm collar, a base style that requires a matching socket and cannot accept wedge-type replacements.
The type 168 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12V and 4.9W, and relies on its wedge-shaped base rather than a locking mechanism to maintain contact within the socket.
At 13W, the type 97 draws considerably more power than the 4.9W type 168, reflecting a meaningful difference in electrical load between the 1977 Royal Monaco and the 1975-1976 models for the same license plate function.
The T10 designation of the type 168 refers to a tubular bulb roughly 10 thirty-seconds of an inch in width, a standard sizing convention used across ANSI miniature bulb classifications.
Because the type 97 uses a bayonet base and the type 168 uses a wedge base, the two bulbs are physically incompatible with each other's sockets, and substitution between the 1977 and 1975-1976 Royal Monaco license plate housings is not supported by these specifications.