The International R102 front and rear turn signal bulbs both utilize a 198 size bulb for proper operation. The replacement chart covers vehicle production spanning 1953 to 1955.
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 tubular glass envelope width, which in this case measures five-eighths of an inch, a common sizing convention in North American automotive lighting standards.
The 198 bulb carries ANSI standardization applicable to both the United States and Canada, meaning its specifications conform to a shared North American regulatory framework.
At 2 watts, the 198 bulb represents a very low power draw, consistent with its role as a signal indicator rather than a primary illumination source.
The International R102 uses the 198 bulb for both the front and rear turn signal positions across the 1953-1955 model years, with all entries falling under the Light Duty classification.
The shared bulb type across both front and rear turn signal positions on the International R102 means a single replacement part satisfies both fitment requirements.
The Light Duty classification noted in the specifications indicates these fitment entries apply specifically to the light duty variant of the R102, and substitution from other duty ratings should not be assumed interchangeable without separate verification.