Fiat Strada front side marker bulbs use 194 or 257 size, while rear side marker bulbs use 194 or 57 size. The replacement chart covers 1979 through 1982 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb is the most frequently specified size across the Fiat Strada's side marker positions, appearing in both front and rear applications for the 1979 and 1981-1982 model years.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards applicable in the United States and Canada.
The T10 wedge base is a push-fit connector with no separate metal base, relying on the glass envelope itself to make contact within the socket.
The 1980 Fiat Strada front side marker departs from the 194 specification, instead using the 257 bulb, which operates at 12V and 2W with either a festoon or BA9s base configuration.
The BA9s is a single-pin bayonet base with a 9mm cap, commonly found in instrument and indicator lighting applications.
The 1980 rear side marker uses the 57 bulb, a single-filament BA9s base type rated at 12V and 1W, making it the lowest-wattage bulb specified across all positions in these data.
The front and rear side marker positions share the same bulb size in every model year except 1980, where the front uses the 257 and the rear uses the 57, indicating those two sockets are not interchangeable for that year.
All three bulb types listed, the 194, 257, and 57, conform to ANSI standards for the US and Canadian markets.
The 257 and 57 both use a BA9s base, but they differ in wattage and filament design, which means they are not functionally equivalent substitutes despite sharing the same base type.
The 194 wedge base and the BA9s base are physically incompatible socket types, so the 1980 specifications require different sockets than those used in the 1979 and 1981-1982 model years.