International S122 utilizes 194 bulb size for front side marker and 97 bulb size for rear side marker applications. The replacement chart covers 1956 to 1957 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 S122 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 US and Canada.
The 194 bulb is a T10 miniature wedge type operating at 12V and 3.78W. Its wedge base design means it requires no separate socket retainer, as the bulb body itself forms the electrical connection.
The 97 bulb is a single-filament type with a BA15s bayonet base, rated at 12V and 13W. The BA15s designation indicates a single-contact bayonet fitting with a 15mm base width.
The 97 is noted as a variant of the 1156 bulb. Despite this relationship, the two are not directly interchangeable in all applications, as wattage and base contact configurations can differ between variants.
The rear side marker draws significantly more wattage than the front, with the 97 rated at 13W compared to the 194 at 3.78W. This difference reflects the distinct photometric demands placed on rear versus front marker positions.
The International S122 (1956-1957) carries the Light Duty classification for both front and rear side marker positions, applying consistently across both model years covered in the specifications.
The front side marker specification for the S122 remains unchanged across the 1956-1957 model years, with the 194 bulb designated for both.
The rear side marker specification similarly holds constant across 1956-1957, with the 97 bulb designated for both years under the Light Duty classification.