International 4400LP front turn signal bulb size 3157NA and rear turn signal bulb size 3157 are specified in this replacement chart. The chart covers vehicle production years spanning 2011 to 2016.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 4400LP uses the 3157NA for its front turn signal across the 2011-2016 model years.
The 3157NA is a dual-filament wedge bulb classified under the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament.
The "NA" suffix in the 3157NA designation indicates natural amber glass, meaning the bulb produces an amber-colored output without relying on a colored lens to achieve that effect.
The rear turn signal on the 4400LP uses the 3157 across the same 2011-2016 model years.
The 3157 shares the same T25 wedge form factor, 12V operating voltage, and 27W/7W dual-filament configuration as the 3157NA, differing only in the absence of amber-tinted glass.
Both the 3157NA and 3157 conform to ANSI standards applicable in the United States and Canada.
Because the 3157 and 3157NA share the same physical base and electrical ratings, the 3157NA is physically interchangeable with the 3157 in the rear position, though the amber tint of the 3157NA may alter the color output depending on the lens color of the rear housing.
The dual-filament design of both bulbs serves two distinct brightness levels within a single unit, which is typical for turn signal applications that also function as parking or running lights.