International C102 utilizes a 194 bulb size for front side marker applications and a 97 bulb size for rear side marker installations. The replacement chart covers 1961 to 1962 production specifications for side marker bulb configurations.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International C102 uses two distinct bulb types across its side marker positions: the 194 for the front and the 97 for the rear, covering the 1961-1962 model years under the Light Duty classification.
The 194 is an ANSI-standardized miniature wedge bulb in a T10 form factor, rated at 12V and 3.78W. The T10 designation refers to a tubular bulb body measuring ten-eighths of an inch in width, with a wedge-style base that requires no separate socket retainer.
The 97 is an ANSI-standardized single-filament bulb fitted with a BA15s bayonet base, rated at 12V and 13W. The BA15s designation indicates a single-contact bayonet cap with a 15mm base width.
The 97 is noted as a variant of the 1156 bulb. While the two share a BA15s base and general construction, they are not universally interchangeable due to differences in wattage and pin indexing tolerances that may affect fitment in specific housings.
The wattage difference between the two bulb types is substantial. The 97 at 13W draws significantly more power than the 194 at 3.78W, reflecting the greater light output typically required of rear marker positions relative to front ones.
Both bulb types conform to ANSI standards recognized in the United States and Canada, indicating standardized electrical and physical specifications applicable across those markets.
The 194 wedge base design requires no locking mechanism beyond the friction fit of the base itself within the socket, which is a characteristic of T10 wedge bulbs generally.
The BA15s base of the 97 uses a single offset pin, distinguishing it from the BA15d double-contact base. Substituting a double-contact variant in a single-contact socket is not supported by the specifications and would present a fitment conflict.