Plymouth Laser high beam headlight bulbs use 9005 or H4666 size, while low beam headlight bulbs use 9006 or H4666 size. The replacement chart covers 1990 to 1994 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 Plymouth Laser used two distinct headlight technologies across its production run. The 1990-1991 model years used the H4666 sealed beam unit for both high and low beam functions, while the 1992-1994 model years transitioned to separate replaceable halogen bulbs for each function.
The H4666 is a rectangular sealed beam unit operating at 12V. It is not a replaceable bulb in the conventional sense; the entire unit requires replacement when it fails. This format was common in North American vehicles before the widespread adoption of replaceable halogen capsules.
The 9005 bulb, used for high beam on the Plymouth Laser from 1992-1994, is a single-filament halogen type rated at 12V and 65W, fitted with a P20d base. It conforms to ANSI standards applicable in the United States and Canada.
The 9006 bulb, used for low beam on the 1992-1994 Laser, is also a single-filament halogen type rated at 12V but draws 55W, which is lower than the 9005. It uses a P22d base, which is physically distinct from the P20d base of the 9005.
The differing base types between the 9005 (P20d) and 9006 (P22d) mean the two bulbs are not interchangeable, despite their similar appearance and shared voltage rating. Installing one in place of the other is not possible without modification.
All three bulb types listed across the Laser's headlight specifications conform to ANSI standards for the United States and Canada, indicating they are standardized for the North American market.