International C1200 front side marker bulb uses 194 size while rear side marker bulb uses 97 size. Replacement chart covers 1963 to 1964 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 C1200 (Light Duty) uses the 194 bulb for the front side marker position across the 1963-1964 model years.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, recognized in both the United States and Canada.
The T10 wedge base on the 194 requires no locking mechanism, as the wedge-shaped base itself holds the bulb in place within the socket.
The rear side marker position on the International C1200 (Light Duty) calls for the 97 bulb across the same 1963-1964 model years.
The 97 is an ANSI-standard single-filament bulb rated at 12V and 13W, mounted on a BA15s bayonet base, and is recognized in both the United States and Canada.
The BA15s designation indicates a single-contact bayonet base with a 15mm collar, which is not interchangeable with the BA15d double-contact variant.
The 97 is described as a variant of the 1156, meaning the two share a general family relationship, though they are not confirmed as direct substitutes within these specifications.
The wattage difference between the front and rear side marker bulbs is substantial, with the rear 97 drawing roughly 3.4 times more power than the front 194, reflecting the different luminous output requirements of each position.
The 194 and 97 use entirely different base types, a wedge and a bayonet respectively, making them physically non-interchangeable with each other.