Plymouth Turismo 2.2 high beam headlight bulbs use H4651 size while low beam headlight bulbs use H4656 or H4652 size. The replacement chart covers 1983 to 1986 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 Turismo 2.2 uses sealed beam headlight units across all listed model years (1983-1986), meaning the entire lens-and-filament assembly is replaced as one unit rather than a separate bulb being swapped out.
All three headlight types found in these specifications, the H4651, H4652, and H4656, conform to ANSI standards recognized in both the United States and Canada, and all operate at 12 volts.
Each of these sealed beam units follows the 4x6-inch rectangular form factor, a standardized size that was widely adopted in North American vehicle production during this era.
The H4652 is a variant of the H4651, which means the two share the same basic sealed beam format while differing in their light output characteristics, making them non-interchangeable despite their physical similarities.
The high beam position uses the H4651 consistently across all four model years (1983-1986), while the low beam position shows a split between two different bulb types depending on the year.
For the Plymouth Turismo 2.2, the low beam specification changed between certain years: the H4656 was used in 1983 and 1986, while the H4652 was used in 1984 and 1985, making year verification essential before sourcing a replacement unit.
Because the H4651 and H4656 are both 4x6-inch rectangular sealed beams yet serve different beam functions, substituting one for the other would result in incorrect light output for that headlight position.