The Dodge 400 front and rear side marker bulbs both utilize a 168 bulb size. The replacement chart covers 1982 to 1983 vehicle 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 168 bulb is the sole bulb type listed across all side marker positions for the Dodge 400, appearing in both the front and rear side marker applications for 1982-1983.
The 168 bulb follows the ANSI standard recognized in the United States and Canada, classifying it as a regionally standardized automotive component.
It is a miniature wedge-type bulb, designated T10, which refers to its tubular glass envelope with a wedge base that connects directly into a socket without a separate metal base or pins.
The T10 wedge format is a push-in design, meaning the bulb is retained by friction from the socket walls rather than by a bayonet or screw mechanism.
The 168 bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of that era.
Its rated wattage of 4.9W places it in the low-power category, which is typical for side marker applications where the function is visibility rather than illumination.
Because the same bulb number, 168, is specified for both the front and rear side marker positions across both model years, the front and rear sockets accept an identical bulb, which simplifies parts sourcing.
The T10 wedge base is shared by several bulb numbers in the miniature wedge family, so substitution with a physically similar bulb of a different wattage or lumen output would not conform to the listed specification.