The Pontiac Parisienne front turn signal requires a 2057NA bulb size while the rear turn signal uses a 2057 bulb size. The replacement chart covers 1983 to 1986 model 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 Pontiac Parisienne uses the 2057NA bulb for the front turn signal across the 1983-1986 model years.
The 2057NA is a dual-filament bulb operating at 12V with a high/low wattage rating of 26.9W and 8W respectively, mounted via a BAY15d bayonet base.
The "NA" designation in 2057NA indicates natural amber glass, meaning the bulb produces an amber output without relying on a colored lens to achieve the required turn signal color.
The rear turn signal on the Parisienne across the same 1983-1986 model years uses the 2057 bulb rather than the 2057NA.
The 2057 shares the same dual-filament construction, BAY15d bayonet base, and 12V/26.9W/8W electrical ratings as the 2057NA, differing only in the absence of amber-tinted glass.
Both the 2057 and 2057NA are classified as brighter variants of the 1157 bulb, meaning the 1157 is not a direct equivalent and substituting it would result in reduced output.
The BAY15d bayonet base is shared by both bulb types, which means the front and rear sockets are physically compatible with either bulb, though the amber tinting of the 2057NA is specific to the front position.
Both bulb types conform to ANSI standards applicable in the United States and Canada, placing them within a standardized North American specification framework.