International 1310 front side marker bulbs measure 194 in size, while rear side marker bulbs measure 97, with each bulb type serving distinct lighting functions on the vehicle. The replacement chart covers 1971 to 1973 model years and details bulb size specifications corresponding to each production year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 1310 uses two distinct bulb types across its front and rear side marker positions: the 194 and the 97, both conforming to ANSI standards recognized in the United States and Canada.
The 194 bulb is a T10 miniature wedge type rated at 12 volts and 3.78 watts, placing it in the low-wattage range typical of parking and marker light applications.
The 97 bulb is a single-filament type with a BA15s bayonet base, rated at 12 volts and 13 watts, representing a significantly higher wattage output than the 194 used at the front.
The 97 bulb is a variant of the 1156, meaning the two share a common BA15s base design, though they are not identical and the distinction is relevant to fitment.
The 194 bulb serves the front side marker position on the International 1310 across the 1971-1973 model years, with the 1971 and 1972 entries carrying a Light Duty designation.
The rear side marker position on the International 1310 uses the 97 bulb across the 1971-1973 model years, with all three years carrying a Light Duty designation.
The Light Duty designation present on the rear side marker entries for 1971-1973 indicates a vehicle configuration distinction, and the 97 bulb applies specifically within that classification.
The front and rear side marker positions on the International 1310 are not interchangeable in bulb type, as the front uses a wedge-base 194 while the rear uses a bayonet-base 97, making the two physically incompatible with each other's sockets.