International 7300 front turn signal bulbs use 3157NA size while rear turn signal bulbs use 3157 size. The replacement chart covers 2008 to 2017 production years 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 7300 uses the 3157NA bulb for the front turn signal across all listed model years, 2008-2017.
The rear turn signal on the International 7300 uses the 3157 bulb across the same 2008-2017 span.
Both the 3157NA and 3157 are dual-filament T25 wedge bulbs rated at 12V with a 27W high-filament and 7W low-filament output, making them suitable for combined turn signal and parking light functions within a single housing.
The 3157NA and 3157 share the same ANSI designation family and physical T25 wedge form, meaning they are dimensionally identical and use the same socket type.
The key distinction between the two bulbs is that the 3157NA features natural amber-tinted glass, while the 3157 uses clear glass. This difference affects the color of emitted light without altering the electrical or mechanical specifications.
Because the front position calls specifically for the 3157NA, substituting a clear 3157 in that position would change the output from amber to white unless the lens itself provides the amber coloring.
Both bulbs conform to ANSI standards applicable in the United States and Canada, indicating they meet regulated performance and safety criteria for those markets.
The dual-filament design of both bulbs allows a single unit to serve two independent circuit functions, typically a brighter filament for the active turn signal and a dimmer filament for a steady marker or parking light role.