Buick Park Avenue front and rear turn signal bulbs utilize 3057 and 2057NA or 2057 bulb sizes depending on location and model variation. The replacement chart documents bulb size specifications across 1991 to 2005 vehicle production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 3057 bulb is the most widely specified turn signal bulb across the Buick Park Avenue lineup, appearing in both front and rear positions across the majority of model years covered in these specifications.
The 3057 is a dual-filament wedge bulb of the T25 type, rated at 12V with a high-intensity filament drawing 27W and a low-intensity filament drawing 7W, conforming to ANSI standards recognized in both the United States and Canada.
The dual-filament design of the 3057 allows a single bulb to serve two lighting functions simultaneously, typically combining turn signal operation with parking or running light duty.
The Buick Park Avenue (1997-2005) uses the 3057 for the front turn signal, while the same bulb also covers the rear turn signal for that same span of years, making the front and rear positions interchangeable during that period.
The front turn signal position on the 1991-1996 Park Avenue uses the 2057NA rather than the 3057, which means the front and rear bulbs are not interchangeable for those model years.
The 2057NA features a natural amber glass envelope, which produces a colored output without relying on a tinted lens, distinguishing it from the clear-glass 2057 variant.
Both the 2057NA and the standard 2057 share a BAY15d bayonet base and identical electrical ratings of 12V at 26.9W/8W, and both are described as brighter variants of the widely used 1157 bulb.
The rear turn signal on the 1991 Park Avenue uses the 2057, which has a clear glass envelope, whereas the front turn signal for that same year uses the 2057NA with its amber glass envelope, indicating the two positions are not interchangeable for that model year.
The BAY15d bayonet base found on both the 2057 and 2057NA is a two-pin offset base, a design that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The T25 wedge base of the 3057 differs structurally from the BAY15d bayonet base of the 2057 and 2057NA, meaning bulbs from these two groups are not physically interchangeable regardless of their similar voltage and wattage ratings.