The International A132 uses a 198 bulb size for both front and rear turn signal applications. 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 A132 uses the 198 bulb for both front and rear turn signals across the 1957-1958 model years.
The 198 is an ANSI-standardized bulb, meaning it conforms to a defined set of electrical and physical specifications recognized across the United States and Canada.
It is classified as a miniature wedge bulb in the T5 form factor, which refers to a tubular glass envelope approximately 5/8 of an inch wide with a wedge-style base that seats directly into a socket without a separate metal cap.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-wattage signal bulbs in automotive applications.
The wedge base design of the 198 means it is not interchangeable with bayonet-base or screw-base bulb types, even where voltage and wattage ratings might otherwise align.
The uniform application of the 198 bulb across both the front and rear turn signal positions on the International A132 means a single bulb type serves all four turn signal sockets on the vehicle.