Rolls-Royce Silver Wraith II Side Marker Bulb Size
The Rolls-Royce Silver Wraith II front and rear side marker bulbs utilize 257 and 194 size specifications. The replacement chart covers vehicle production spanning 1977 to 1980.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Rolls-Royce Silver Wraith II uses two distinct bulb types across its side marker positions: the 257 and the 194, both conforming to ANSI standards recognized in the United States and Canada.
The 257 bulb operates at 12 volts and draws 2 watts. It is available in either a festoon or BA9s base configuration, classifying it as an instrument-grade bulb.
The 194 bulb is a T10 miniature wedge type, operating at 12 volts with a power draw of 3.78 watts, making it slightly higher in wattage than the 257.
For the 1980 model year, both the front and rear side marker positions require the 257 bulb.
For the 1977-1979 model years, both the front and rear side marker positions require the 194 bulb.
The front and rear side marker positions share the same bulb specification for every model year listed, meaning no asymmetry exists between front and rear fitment within a given year.
The 257 bulb's dual base compatibility, festoon and BA9s, means physical socket type is a relevant factor when sourcing a replacement for the 1980 Silver Wraith II, as the two base formats are not interchangeable with each other.
The 194 and 257 bulbs are not interchangeable despite sharing the same 12-volt operating voltage, as they differ in wattage, base type, and bulb construction.