International A102 utilizes a 194 bulb size for the front side marker and a 97 bulb size for the rear side marker. The replacement chart covers 1957 to 1958 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International A102 uses two distinct bulb types across its side marker positions: the 194 for front side markers and the 97 for rear side markers, both covering the 1957-1958 model years under the Light Duty classification.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, operating at 12 volts and drawing 3.78 watts. The T10 designation refers to a tubular bulb body roughly 10/8 of an inch wide, 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, operating at 12 volts and drawing 13 watts. 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 type. While the two share a BA15s bayonet base and single-filament construction, they are not identical, and substitution between them warrants attention to wattage and pin offset compatibility before use.
The wattage difference between the two bulb types is substantial. The 97 at 13 watts draws more than three times the power of the 194 at 3.78 watts, reflecting the greater luminous output typically required at rear marker positions compared to front ones.
Both the 194 and 97 carry ANSI standardization recognized in both the United States and Canada, meaning their electrical and physical specifications conform to a defined industry standard rather than being proprietary to a single manufacturer.
The 194 wedge base and the 97 BA15s bayonet base are mechanically incompatible socket types. The front and rear marker sockets on the International A102 are therefore not interchangeable with each other.