International L122 vehicles utilized 194 bulb size for front side marker applications and 97 bulb size for rear side marker positions. Replacement chart data encompasses 1950 through 1952 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International L122 uses two distinct bulb types across its side marker positions for the 1950-1952 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12 volts and 3.78 watts, and is recognized across both the United States and Canada.
The T10 wedge base of the 194 relies on friction contact rather than a locking mechanism, meaning the bulb is held in place by the socket walls alone.
The 97 is an ANSI-standardized single-filament bulb fitted with a BA15s bayonet base, rated at 12 volts and 13 watts, and is also recognized across both the United States and Canada.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, where the "s" denotes a single contact pin, distinguishing it from dual-contact bayonet variants.
The 97 is classified as a variant of the 1156 bulb family. Despite this relationship, the two are not directly interchangeable, as wattage and base pin positioning can differ between variants within that family.
The wattage difference between the two bulbs is substantial: the rear 97 at 13 watts draws considerably more power than the front 194 at 3.78 watts, reflecting the differing visibility requirements between marker positions.
Both bulb types conform to ANSI standards, meaning their specifications are governed by a standardized classification system rather than proprietary sizing.