Oldsmobile Fiesta front and rear turn signal bulbs utilize 1157 and 1034 size specifications. The replacement chart covers 1953 through 1964 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034 bulb is the most frequently specified size across the Oldsmobile Fiesta's turn signal applications, appearing in both front and rear positions for the 1953 and 1957-1963 model years.
The 1034 is an ANSI-standard dual-filament bulb rated at 12V with a 21W/5W output, where the higher wattage filament serves the active turn signal function and the lower wattage filament serves a secondary lighting role.
Both the 1034 and 1157 bulbs share the BAY15d bayonet base, a two-pin offset base design that physically locks the bulb into the socket with a twist.
The 1034 is classified as a variant of the 1157, meaning the two types share the same base configuration and general construction but differ in filament characteristics.
Because the 1034 and 1157 are distinct ANSI designations despite their shared BAY15d base, substituting one for the other without confirming electrical compatibility carries a risk of mismatched output.
The 1964 Oldsmobile Fiesta is the only model year in these specifications where both the front and rear turn signals use the 1157 bulb rather than the 1034.
Both bulb types carry ANSI standardization applicable to the US and Canadian markets, indicating conformance to a defined set of electrical and physical tolerances.
The front and rear turn signal positions share identical bulb size specifications for every model year listed, meaning no asymmetry exists between the two positions across any year in these data.