International 4300 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 from 2011 to 2018 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 4300 uses the 3157NA bulb for the front turn signal across all listed model years, spanning 2011-2018.
The rear turn signal on the International 4300 uses the 3157 bulb across the same 2011-2018 model year range.
Both the 3157NA and 3157 are ANSI-standardized bulbs, meaning they conform to a defined set of electrical and physical specifications recognized in the United States and Canada.
Both bulbs operate on a 12-volt system and carry a dual-wattage rating of 27W/7W, where the higher wattage corresponds to the turn signal filament and the lower wattage to the parking light filament.
The dual-filament design of both bulbs allows a single unit to serve two lighting functions within one housing.
Both bulbs belong to the T25 wedge form factor, which refers to a wedge-base construction without a separate metal base pin, relying instead on the glass envelope itself to seat into the socket.
The 3157NA differs from the 3157 in that its glass envelope is tinted natural amber, which produces an amber-colored output without requiring an amber lens on the housing.
The 3157 produces a clear or white output, meaning the amber color of the front turn signal on this vehicle is achieved through the bulb glass itself rather than the lens, while the rear relies on the housing lens for color filtering.
Although the 3157 and 3157NA share the same T25 wedge base and electrical ratings, substituting one for the other may affect the color output of the turn signal, as the natural amber tint is a property of the 3157NA glass only.