International A100 Truck front side marker bulb uses 194 size while rear side marker bulb uses 97 size. Replacement chart covers 1957 to 1958 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 A100 Truck uses two distinct bulb types across its front and rear side marker positions for the 1957-1958 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standard miniature wedge bulb of the T10 form factor, rated at 12V and 3.78W, and is recognized in both the United States and Canada.
The T10 wedge base of the 194 requires no locking mechanism, as the bulb is held in place by friction within its socket, a common trait of low-wattage marker and courtesy light applications.
The 97 is an ANSI-standard single-filament bulb rated at 12V and 13W, fitted with a BA15s bayonet base, and is also recognized in both the United States and Canada.
The BA15s designation on the 97 indicates a single-contact bayonet base with a 15mm collar, which locks into its socket with a quarter-turn motion.
The 97 is described as a variant of the 1156, meaning the two share a similar base type but differ in wattage or filament configuration, making them non-interchangeable despite their physical resemblance.
The significant wattage difference between the 194 (3.78W) and the 97 (13W) reflects their respective roles, with the lower-wattage 194 suited to front position marking and the higher-wattage 97 providing greater output at the rear.
Both the 194 and 97 are classified under the Light Duty trim designation for the International A100 Truck across the 1957-1958 model years.