International B100 vehicles utilized 194 bulb size for front side marker applications and 97 bulb size for rear side marker positions. The replacement chart documents bulb specifications across 1959 to 1960 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International B100 uses two distinct bulb types across its front and rear side marker positions for the 1959-1960 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standard miniature wedge bulb classified under the T10 form factor, operating at 12V and drawing 3.78W. 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-standard single-filament bulb fitted with a BA15s bayonet base, operating at 12V and drawing 13W. The BA15s designation indicates a single-contact bayonet mount with a 15mm base width.
The 97 is noted as a variant of the 1156 bulb. While the two share a BA15s base and similar single-filament construction, they are not identical, and substitution between them warrants attention to wattage and physical fit before use.
The 194 and 97 are recognized under both US and Canadian ANSI standards, placing them within a widely adopted North American bulb classification system.
The considerable difference in wattage between the 194 (3.78W) and the 97 (13W) reflects their respective roles. The lower-wattage 194 is typical of small marker or clearance light applications, while the higher-wattage 97 is more consistent with a rear marker or signal function requiring greater light output.
Both bulb types apply exclusively to the Light Duty trim designation of the International B100 for the 1959-1960 model years.