International R110 front side marker bulbs use 194 size while rear side marker bulbs use 97 size. The replacement chart covers 1953 to 1955 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 R110 uses two distinct bulb types across its side marker positions for the 1953-1955 model years: the 194 at the front and the 97 at the rear.
Both the 194 and 97 bulbs conform to ANSI standards recognized in the United States and Canada.
The 194 is a miniature wedge bulb in the T10 form factor, rated at 12 volts and 3.78 watts, making it a low-wattage lamp suited for marker and clearance lighting applications.
The 97 is a single-filament bulb fitted with a BA15s bayonet base, rated at 12 volts and 13 watts, placing it in a significantly higher output category than the front marker bulb.
The BA15s base of the 97 bulb features a single contact pin, which is the defining characteristic that distinguishes it from dual-contact bayonet variants.
The 97 is noted as a variant of the 1156 bulb type. Despite this relationship, the two are not directly interchangeable, as physical and electrical differences between variants can affect fitment and circuit compatibility.
The 194 wedge base and the BA15s bayonet base of the 97 are mechanically incompatible with each other, meaning the front and rear marker sockets on the International R110 do not accept the same bulb.
The wattage difference between the 194 (3.78W) and the 97 (13W) reflects their respective roles, with the higher-wattage 97 providing greater luminous output at the rear marker position.