The International S130 uses a 198 bulb size for both front and rear turn signal applications. This replacement chart covers 1956 to 1957 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The bulb type 198 is an ANSI-standardized miniature wedge bulb classified under the T5 form factor, operating at 12 volts and drawing 2 watts.
The T5 designation refers to the bulb's tubular shape, with the numerical suffix indicating its width in eighths of an inch, making it one of the smaller form factors in automotive lighting applications.
The International S130 uses the 198 bulb across both its front and rear turn signal positions for the 1956-1957 model years.
All listed S130 turn signal applications fall under the Light Duty classification, which typically denotes vehicles rated for lighter load capacities within a manufacturer's lineup.
The 198 bulb's low 2-watt draw reflects its role as a signaling rather than an illumination source, consistent with its use in turn signal circuits rather than headlamp or driving light positions.
Because the same bulb size is shared across both the front and rear turn signal positions, a single part number satisfies all four turn signal sockets on the International S130 for the covered model years.
The wedge base design of the 198 bulb means it is retained by friction within its socket rather than by a bayonet or screw mechanism, which affects socket compatibility when considering replacement options.
ANSI standardization of the 198 bulb indicates that its physical and electrical specifications are governed by a recognized industry body, providing consistency across manufacturers producing this bulb type in the US and Canada.