International C1000 utilizes a 194 bulb size for front side marker applications and a 97 bulb size for rear side marker installations. The replacement chart covers 1963 to 1964 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 C1000 uses two distinct bulb types across its side marker positions for the 1963-1964 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, making it a low-wattage lamp suited for marker and clearance lighting applications.
The T10 wedge base of the 194 requires no separate socket retainer, as the bulb body itself acts as the retention mechanism within the housing.
The 97 is an ANSI-standardized single-filament bulb fitted with a BA15s bayonet base, rated at 12V and 13W, placing it in a significantly higher output category than the front marker bulb.
The BA15s designation on the 97 indicates a single-contact bayonet base with a 15mm collar, which is not interchangeable with the BA15d double-contact variant despite sharing the same physical collar size.
The 97 is noted as a variant of the 1156, meaning the two share a common base type, though wattage or filament specifications may differ between them, and substitution should be verified against the original rating.
Both the 194 and 97 conform to ANSI standards applicable in the United States and Canada, indicating standardized dimensional and electrical tolerances across manufacturers producing these bulb types.
The front and rear side marker positions on the International C1000 (1963-1964) draw from different wattage classes, with the rear 97 consuming roughly 3.4 times more power than the front 194.