International S110 front side marker bulbs measure 194 in size, while rear side marker bulbs measure 97, with each bulb type specified for its corresponding location on the vehicle. The replacement chart covers 1956 to 1957 model years and documents bulb size specifications across the vehicle production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International S110 uses two distinct bulb types across its side marker positions: the 194 for the front and the 97 for the rear, both conforming to ANSI standards recognized in the United States and Canada.
The 194 bulb follows the T10 miniature wedge form factor, operating at 12 volts and drawing 3.78 watts. Its wedge base design means it requires no separate socket retainer, as the bulb body itself acts as the retention mechanism.
The 97 bulb uses a BA15s single-contact bayonet base and draws 13 watts at 12 volts, making it significantly higher in wattage than the 194 used at the front positions.
The 97 is a variant of the 1156 bulb family. While the two share the BA15s bayonet base, they are not identical in wattage output, and substituting one for the other without confirming socket and circuit compatibility is not advisable.
The front side marker positions on the International S110 for model years 1956-1957 are specified exclusively for Light Duty trim, with the 194 bulb assigned to both years.
The rear side marker positions on the International S110 for model years 1956-1957 are likewise specified for Light Duty trim, with the 97 bulb assigned to both years.
The wattage difference between the front and rear side marker bulbs is substantial. The rear 97 bulb at 13 watts draws more than three times the power of the front 194 bulb at 3.78 watts, reflecting their different roles in visibility signaling.