International R112 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 R112 uses two distinct bulb types across its side marker positions: the 194 at the front and the 97 at the rear, both conforming to ANSI standards recognized in the United States and Canada.
Both bulb types are specified uniformly across the 1953-1955 model years for Light Duty trim, with no variation in bulb size between those years.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W. Its wedge base design means it is retained by spring tension in the socket rather than by a locking mechanism.
The 97 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 13W. The BA15s designation indicates a single-contact bayonet fitting with a 15mm base collar.
At 13W, the 97 draws considerably more power than the 3.78W 194, reflecting its role as a rear marker where greater visibility output is typically required.
The 97 is noted as a variant of the 1156. While the two share a BA15s bayonet base, they are not identical in wattage or filament specification, and substitution between them warrants attention to socket and circuit compatibility.
The T10 wedge form factor of the 194 is a widely used miniature bulb standard, and aftermarket equivalents are commonly available under designations such as W5W in international markets, though the 194 designation is specific to the ANSI classification system.