The Plymouth PB200 high beam headlight uses H4651 or H6024 bulb size, while low beam headlight applications require H4656, H4652, or H6024 bulb sizes. The replacement chart covers 1975 to 1980 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 H6024 is a 7-inch round sealed beam unit operating at 12V and conforming to ANSI standards for the US and Canadian markets. It serves as both the high beam and low beam headlight on the Plymouth PB200 for model years 1975-1978, meaning a single bulb type covers both functions in those years.
The H4651 and H4656 are 4x6-inch rectangular sealed beam units, each operating at 12V under ANSI standards. The Plymouth PB200 transitions to these rectangular units for the 1979-1980 model years, replacing the round H6024 format used in earlier years.
All four bulb types listed in these specifications, H4651, H4656, H6024, and H4652, are sealed beam units. In a sealed beam design, the reflector, lens, and filament are fused into a single glass assembly, so the entire unit requires replacement rather than just an internal bulb.
The H4652, used as the low beam headlight on the 1979 PB200, is described as a variant of the H4651. Although both are 4x6-inch rectangular sealed beam units at 12V, they are distinct part numbers and are not interchangeable without verification, as low beam and high beam units differ in filament position and light distribution.
For the 1980 model year, the Plymouth PB200 uses the H4651 for the high beam and the H4656 for the low beam. Both are 4x6-inch rectangular sealed beam units, but they carry different ANSI designations and serve separate optical functions, making them non-interchangeable between positions.
The shift from round H6024 units to rectangular sealed beam units occurs between the 1978 and 1979 model years on the PB200. This reflects a broader industry transition during that period from circular to rectangular headlight formats in North American vehicle design.