Plymouth Reliant front and rear side marker bulbs utilize a 168 bulb size across both positions. The replacement chart covers vehicle production spanning 1981 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Reliant uses the 168 bulb for both front and rear side marker positions across all model years covered in the specifications, spanning 1981-1989.
The 168 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical standards shared by both markets.
The 168 bulb follows the T10 miniature wedge form factor, which is a small, wedge-shaped base design that inserts directly into a socket without requiring a separate metal base or bayonet pins.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of side marker applications where continuous illumination is expected without significant electrical load.
Because the Plymouth Reliant (1981-1989) uses the same 168 bulb in all four side marker positions, front and rear replacements draw from a single bulb specification, simplifying parts sourcing.
The T10 wedge base of the 168 is a widely used form factor that appears across many vehicle makes and model years, which means the bulb is broadly available in the aftermarket.
Although the 168 and the closely related 194 bulb share the same T10 wedge base and physical profile, they differ in wattage. The 194 is rated at 3.78 watts versus the 168 at 4.9 watts, and substituting one for the other may affect brightness or socket compatibility depending on the application.