Plymouth Laser front and rear side marker bulbs utilize 168 and 904 bulb sizes depending on location and model variant. The replacement chart covers 1990 through 1994 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 Plymouth Laser uses two distinct bulb sizes across its side marker positions: the 168 and the 904, both of which are ANSI-standardized miniature wedge bulbs of the T10 type rated at 12 volts.
Although both bulbs share the same T10 wedge form factor, they are not interchangeable, as the 168 operates at 4.9 watts while the 904 operates at 8 watts, representing a notable difference in power draw.
The front side marker position on the Plymouth Laser uses the 168 bulb across all model years from 1990-1994.
The rear side marker position shifted from the 904 bulb in 1990-1992 to the 168 bulb in 1993-1994, meaning the front and rear positions share the same bulb size only in the later two model years.
The T10 wedge base is a tool-free, push-in socket design, which means no twisting or locking motion is required during installation or removal.
Both the 168 and 904 carry ANSI standardization applicable to the US and Canadian markets, indicating compliance with North American automotive lighting standards for those regions.
The wattage difference between the two bulbs means that substituting a 904 in a socket rated for a 168 would introduce a higher electrical load than the circuit was originally specified to handle.