Rolls-Royce Silver Cloud License Plate Bulb Size

The Rolls-Royce Silver Cloud license plate light requires a single bulb size 89 for proper illumination of the rear vehicle identification area. Data for the specific component covers a continuous span from 1955 through 1962.

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
1955-1962	89

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	89

Other Locations

Additional Notes

The Rolls-Royce Silver Cloud uses the 89 bulb for its license plate position across all listed model years, spanning 1955-1962.
The 89 is an ANSI-standardized bulb type recognized in both the United States and Canada.
It operates on a 12-volt electrical system and draws 13 watts, placing it in the low-wattage range for incandescent automotive bulbs.
The 89 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount with a 15mm collar width.
As a single-filament bulb, the 89 serves functions that require only one lighting mode, such as a continuously illuminated license plate light.
The 89 is a lower-wattage variant of the 1156 bulb. While both share the BA15s base, the difference in wattage means the two are not interchangeable without accounting for the change in output and electrical load.