Plymouth GTX front and rear side marker bulbs utilize 194 and 1895 bulb sizes across the vehicle's lighting system. The replacement chart covers 1968 to 1971 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 GTX side marker specifications cover the 1968, 1970, and 1971 model years, with both front and rear positions listed for each year.
The 194 bulb is a miniature wedge type with a T10 form factor, rated at 12V and 3.78W, and conforms to ANSI standards for the US and Canadian markets.
The 1895 bulb is a miniature wedge type with a T5 form factor, rated at 12V and 0.9W, and also conforms to ANSI standards for the US and Canadian markets.
The T10 form factor of the 194 bulb is physically larger than the T5 form factor of the 1895 bulb, meaning the two types are not interchangeable despite both using a wedge base design.
The 194 bulb draws significantly more wattage than the 1895, reflecting a difference in light output between the two bulb types.
For the Plymouth GTX, the 1970-1971 model years share the 194 bulb across both front and rear side marker positions.
The 1968 Plymouth GTX uses the 1895 bulb in both the front and rear side marker positions, distinguishing it from the later 1970-1971 fitment.
The symmetrical front and rear bulb fitment in each model year indicates that a single bulb type services all four side marker positions on the vehicle for a given year.