International L120 vehicles utilized 194 bulb size for front side marker applications and 97 bulb size for rear side marker positions. The replacement chart covers 1950 through 1952 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 L120 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. The T10 designation refers to a tubular bulb body roughly 10/8 of an inch wide, with a wedge-style base that seats directly into a socket without a separate metal base.
The 97 is an ANSI-standardized single-filament bulb rated at 12 volts and 13 watts, fitted with a BA15s bayonet base. The BA15s designation indicates a single-contact bayonet mount with a 15mm base width.
The 97 is noted as a variant of the 1156 bulb. While the two share the BA15s bayonet base type, they are not identical in wattage or filament design, and direct substitution between them is not confirmed by these specifications.
Both the 194 and 97 conform to ANSI standards recognized in the United States and Canada, indicating standardized dimensional and electrical tolerances within those markets.
The wattage difference between the front and rear marker bulbs is substantial. The rear 97 bulb draws approximately 3.4 times more power than the front 194 bulb, which reflects the differing visibility requirements typically assigned to rear marker lighting.
The 194 wedge base and the 97 bayonet base are mechanically incompatible socket types. The front and rear marker sockets on the International L120 are therefore not interchangeable with each other.