The Plymouth PB350 high beam headlight uses H6024 or H4651 bulb size, while low beam headlight applications require H6024, H4652, or H4656 bulb sizes. The replacement chart covers 1981 to 1983 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 PB350 headlight system used two distinct sealed beam formats across its 1981-1983 model years: a 7-inch round unit designated H6024 and a 4x6-inch rectangular family encompassing the H4651, H4652, and H4656 designations.
All four bulb types found in the Plymouth PB350 specifications conform to ANSI standards recognized in both the United States and Canada, and all operate on a 12V electrical system.
Each of these headlight units is a sealed beam assembly, meaning the lens, reflector, and filament are fused into a single unit. When a filament fails, the entire assembly requires replacement rather than an internal bulb swap.
The H6024 sealed beam serves as both the high beam and low beam unit on the 2-round-headlamp configuration for 1982-1983, indicating that vehicles with this setup used a dual-filament design within a single 7-inch round housing per side.
On the 4-rectangular-headlamp configuration for 1982-1983, the high beam and low beam functions are split across different part numbers: H4651 handles high beam duty while H4652 and H4656 serve low beam positions, making the two positions non-interchangeable despite sharing the same physical 4x6-inch format.
The 1981 model year carried only the 4-rectangular-headlamp configuration, using H4651 for high beam and H4656 for low beam, with no round headlamp variant listed for that year.
Because H4651, H4652, and H4656 share the same 4x6-inch rectangular housing format, physical fitment across these part numbers is possible, but their internal filament configurations differ by function, making substitution between high beam and low beam positions technically incorrect.
The H4652 is noted as a variant of the H4651, yet the two carry separate ANSI designations and occupy different positions within the headlamp system, reflecting a functional distinction despite their close relationship within the rectangular sealed beam family.