The International R122 uses a 194 bulb size for front side marker applications and a 97 bulb size for rear side marker positions. The replacement chart covers 1953 to 1955 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 R122 uses two distinct bulb types across its side marker positions: the 194 for front side markers and the 97 for rear side markers, both applying uniformly across the 1953-1955 model years.
Both the 194 and 97 bulbs conform to ANSI standards recognized in the United States and Canada.
The 194 is a T10 miniature wedge bulb, meaning it uses a wedge-shaped base rather than a metal socket pin or bayonet fitting, and is rated at 12V and 3.78W.
The 97 is a single-filament bulb rated at 12V and 13W, fitted with a BA15s bayonet base, which uses a single locating pin to secure the bulb in its socket.
The 97 bulb is a variant of the 1156, though the two are not identical, and substituting one for the other without confirming socket and wattage compatibility with the International R122 (1953-1955) carries a fitment risk.
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 differing visibility demands typically placed on rear marker lighting.
The T10 wedge format of the 194 is not mechanically interchangeable with the BA15s bayonet base of the 97, as the two mounting systems are physically incompatible.
The Light Duty designation applies to all listed entries for both the front and rear positions across the 1953-1955 model years, indicating these specifications correspond to the light-duty configuration of the R122.