The Rolls-Royce Silver Shadow front side marker uses a 194 or 194NA bulb size, while the rear side marker requires a 194 bulb size. The replacement chart covers 1970 through 1976 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 and 194NA bulbs are the two types specified for the Rolls-Royce Silver Shadow across all listed model years, covering both front and rear side marker positions.
Both the 194 and 194NA are ANSI-standard miniature wedge bulbs of the T10 form factor, rated at 12 volts and 3.78 watts.
The 194NA is a natural amber glass variant of the standard 194 bulb, sharing identical electrical ratings and the same T10 wedge base.
The front side marker position on the Silver Shadow uses the 194NA for model years 1970-1975, while the 1976 model year uses the standard clear 194 bulb instead.
The rear side marker position uses the standard 194 bulb across all listed model years, from 1970 through 1976.
The shift from 194NA to 194 in the front side marker for the 1976 Silver Shadow reflects a change in the amber light source, moving from a tinted glass envelope to a clear bulb, which typically implies the amber color is produced by the lens rather than the bulb itself.
Although the 194 and 194NA share the same T10 wedge base and electrical specifications, substituting a clear 194 for a 194NA in a position designed for an amber-producing bulb may alter the emitted light color if the housing lens is also clear.