Rolls-Royce Silver Shadow II Side Marker Bulb Size
The Rolls-Royce Silver Shadow II front side marker utilizes 257 and 194 bulb sizes, while the rear side marker employs 57 and 194 bulb sizes. The replacement chart covers 1977 to 1980 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 Rolls-Royce Silver Shadow II uses three distinct bulb types across its front and rear side marker positions: the 257, 194, and 57, all of which conform to ANSI standards recognized in the United States and Canada.
The 194 bulb is the most frequently specified type in these listings, appearing in both the front and rear side marker positions for the 1977-1979 model years.
The 194 is a T10 miniature wedge bulb operating at 12V with a power draw of 3.78W. Its wedge base design means it is retained by friction rather than a locking mechanism, which distinguishes it from pin-base or bayonet-base types.
The 1980 Rolls-Royce Silver Shadow II front side marker uses the 257 bulb, which operates at 12V and draws 2W. The 257 is noted as accepting either a festoon or BA9s base configuration, meaning the physical base type can vary by manufacturer while still meeting the same ANSI designation.
The 1980 rear side marker uses the 57 bulb, a single-filament type with a BA9s base rated at 12V and 1W, making it the lowest-wattage bulb among the three types listed in these specifications.
The BA9s base found on both the 257 and 57 bulbs is a small bayonet-cap fitting. Despite sharing this base type, the two bulbs are not interchangeable due to differences in wattage, physical form factor, and intended application.
The 1980 model year represents a departure from the 1977-1979 fitment pattern, with both the front and rear side marker positions calling for different bulb types than those used in the three preceding years.
The 194 and 257 bulbs both operate at 12V but differ in wattage, 3.78W versus 2W respectively, and in base type, wedge versus BA9s or festoon. These differences make them non-interchangeable despite their shared voltage rating.