International A110 front side marker bulbs use 194 size while rear side marker bulbs use 97 size. The 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 A110 uses the 194 bulb for front side marker positions across the 1957-1958 model years, while the 97 bulb serves the rear side marker positions across the same span.
The 194 is an ANSI-standardized miniature wedge bulb of the T10 form factor, rated at 12V and 3.78W, recognized in both the United States and Canada.
The T10 wedge base of the 194 bulb requires no locking mechanism, as the wedge-shaped base itself holds the bulb in place within the socket.
The 97 bulb is an ANSI-standardized single-filament type with a BA15s bayonet base, rated at 12V and 13W, and is recognized in both the United States and Canada.
At 13W, the 97 bulb draws considerably more power than the 3.78W 194, reflecting its role in a rear marker position where greater light output is typical.
The 97 bulb is noted as a variant of the 1156. The BA15s bayonet base is shared between these two types, but wattage and other electrical characteristics differ, making them non-interchangeable despite the physical similarity.
The Light Duty designation applies to all listed positions on the International A110 for both model years, indicating these fitments correspond to the lighter vehicle configuration rather than a heavier commercial variant.
The BA15s base of the 97 bulb features a single contact pin, distinguishing it from the dual-pin BA15d base. Substituting a dual-pin base bulb into a single-pin socket is not possible without modification.