International S102 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 S102 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 metal base, as the glass envelope itself acts as the retaining element within the socket.
The 97 bulb operates at 12V and 13W, drawing significantly more wattage than the 194. This higher wattage is consistent with rear marker applications, which typically require greater light output for visibility from following traffic.
The 97 bulb uses a BA15s bayonet base, which is a single-contact bayonet fitting. This base type is mechanically distinct from the wedge socket used by the 194, meaning the two bulbs are not interchangeable between front and rear positions.
The 97 is noted as a variant of the 1156 bulb. While the 1156 is a widely available single-filament bayonet bulb, the 97 variant differs in wattage and light output, and substitution between the two warrants attention to socket and application compatibility.
The International S102 (Light Duty) carries these bulb specifications across the 1956-1957 model years, with no variation in bulb size between those two years for either the front or rear side marker positions.