The Ford Five Hundred front turn signal requires a 3157NA bulb size, while rear turn signal applications use either 4057 or 3157 bulb sizes. The replacement chart covers vehicle production spanning 2005 to 2007.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Five Hundred uses three bulb types across its front and rear turn signal positions for the 2005-2007 model years: the 3157NA, 4057, and 3157.
All three bulb types share the same T25 wedge form factor, dual-filament construction, and 12V electrical rating with a 27W/7W wattage split, making them electrically and physically similar.
The 27W/7W dual-filament design allows a single bulb to serve two brightness levels, typically supporting both turn signal and parking light functions from one housing.
The 3157NA is the designated front turn signal bulb for the Ford Five Hundred across all three model years (2005-2007). The "NA" suffix indicates natural amber glass, which produces an amber output without relying on a colored lens.
The natural amber glass of the 3157NA is a built-in tint within the bulb envelope itself, distinguishing it from clear-glass variants that depend on an amber lens to produce the required turn signal color.
The 4057 serves as the rear turn signal bulb for the 2006-2007 Ford Five Hundred. Although it shares the T25 form factor and 27W/7W rating with the 3157, the two carry different ANSI designations and are not listed as interchangeable within these specifications.
The 2005 Ford Five Hundred rear turn signal uses the 3157, while the 2006-2007 model years use the 4057. This represents a rear-position bulb change between the 2005 and 2006 model years.
All three bulb types conform to ANSI standards applicable in both the United States and Canada, indicating compliance with North American automotive lighting requirements.