International C100 utilizes a 194 bulb size for the front side marker and a 97 bulb size for the rear side marker. The replacement chart covers 1961 to 1962 vehicle production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International C100 uses two distinct bulb types across its front and rear side marker positions for the 1961-1962 model years, with each position requiring a specific and non-interchangeable bulb.
The 194 bulb is an ANSI-standardized miniature wedge type with a T10 form factor, operating at 12 volts and drawing 3.78 watts, which places it in the low-wattage range typical of marker and courtesy lighting applications.
The T10 wedge base of the 194 bulb relies on direct contact between the bulb's glass envelope and the socket housing rather than a locking mechanism, making socket compatibility dependent on the physical fit of the wedge.
The 194 bulb is specified for the front side marker position on the International C100 across the 1961-1962 model years under the Light Duty classification.
The 97 bulb uses a BA15s bayonet base, which is a single-contact base that locks into its socket with a quarter-turn motion. This base type is mechanically distinct from the wedge base used by the 194 and the two are not interchangeable.
At 13 watts, the 97 bulb draws considerably more power than the 194, reflecting its role in the rear side marker position where higher light output is generally associated with visibility requirements.
The 97 bulb is described as a variant of the 1156, meaning it shares the BA15s bayonet base but differs in wattage and filament characteristics, and the two should not be treated as direct substitutes without confirming socket and circuit compatibility.
The 97 bulb is specified for the rear side marker position on the International C100 across the 1961-1962 model years under the Light Duty classification.
Both the 194 and 97 bulbs conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical specifications within those markets.
The Light Duty classification attached to all listed entries suggests these specifications apply specifically to that vehicle configuration and may not extend to other duty ratings of the C100.