The International 1210 front and rear turn signal bulbs both utilize a 198 size bulb for proper operation. The replacement chart covers vehicle production spanning 1971 to 1973.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 198 bulb is the sole bulb type listed across all front and rear turn signal positions for the International 1210 across the 1971-1973 model years.
The 198 bulb is an ANSI-standardized type used in both the United States and Canada, confirming its application within North American vehicle markets.
It follows the T5 miniature wedge form factor, which uses a wedge-shaped base in place of a traditional metal contact base, allowing the bulb to seat directly into a compatible socket without a separate holder.
The 198 operates at 12 volts and draws 2 watts, placing it at the low end of the power range for automotive signal lighting.
The 1971 and 1972 model year entries carry a Light Duty designation, indicating those fitments apply specifically to the light duty configuration of the International 1210 rather than to all variants of those years.
The 1973 entries for both front and rear turn signals carry no duty-class qualifier, distinguishing them from the 1971-1972 Light Duty-specific listings.
Because both the front and rear turn signal positions share the same 198 bulb specification across all listed years, the same bulb type serves both signal locations on the vehicle.
The T5 designation refers to the bulb's tubular envelope, with the numeric portion indicating a width of five-eighths of an inch, which is a standard sizing convention used in ANSI bulb nomenclature.