International SA120 front side marker bulbs measure 194 in size, while rear side marker bulbs measure 97, with each bulb type specified for its corresponding location on the vehicle. The replacement chart covers 1956 to 1957 model years and documents bulb size specifications across the vehicle production range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International SA120 uses the 194 bulb for front side marker positions across both 1956 and 1957 model years in Light Duty trim.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards recognized in both the United States and Canada.
The T10 wedge base design requires no locking mechanism, as the bulb is held in place by the socket walls alone.
Rear side marker positions on the International SA120 (1956-1957, Light Duty) use the 97 bulb, which operates at a significantly higher wattage of 13W compared to the 3.78W front marker bulb.
The 97 bulb uses a BA15s bayonet base, a single-contact fitting that locks into the socket with a quarter-turn motion.
The 97 is classified as a variant of the 1156 bulb family, though the two are not identical and are not interchangeable without confirming socket and wattage compatibility.
Both the 194 and 97 bulbs conform to ANSI standards, meaning their physical and electrical specifications are standardized across manufacturers producing them for the US and Canadian markets.
The difference in wattage between the front 194 (3.78W) and rear 97 (13W) reflects a functional distinction, with rear side markers drawing considerably more power than their front counterparts on this vehicle.