Pontiac Safari front turn signal bulbs use 2057NA size while rear turn signal bulbs use 2057 size. The replacement chart covers 1987 to 1989 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 Safari uses two closely related bulb types across its front and rear turn signal positions for the 1987-1989 model years: the 2057NA at the front and the 2057 at the rear.
Both the 2057NA and 2057 are ANSI-standardized dual-filament bulbs operating at 12V with a wattage rating of 26.9W on the high-filament circuit and 8W on the low-filament circuit.
Each bulb uses a BAY15d bayonet base, a two-pin offset base design that ensures correct rotational orientation during installation.
Both bulb types are described as brighter variants of the 1157, meaning they share the same base and general form factor as the 1157 but produce higher light output on the primary filament.
The 2057NA, specified for the front turn signal position, incorporates natural amber glass, which produces the amber signal color directly from the bulb itself rather than relying solely on a colored lens.
The 2057, specified for the rear turn signal position, does not incorporate colored glass, meaning the amber signal color at the rear is produced by the vehicle's lens rather than the bulb.
Because the 2057NA and 2057 share the same BAY15d base and identical voltage and wattage ratings, they are physically interchangeable, though substituting a 2057 in place of a 2057NA at the front position would affect amber color output if the front lens is clear.