Plymouth Road Runner high beam and low beam headlight bulbs utilize H6024 and H5001 sizes for high beam applications, with H6024 and H5006 sizes for low beam configurations, representing the bulb specifications across multiple model generations. The replacement chart documents bulb size data spanning 1968 through 1975 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Road Runner uses three distinct sealed beam unit types across its headlight specifications: H6024, H5001, and H5006. All three conform to ANSI standards recognized in both the United States and Canada and operate on a 12V electrical system.
All three sealed beam types are complete self-contained units in which the lens, reflector, and filament are fused into a single assembly. When a unit fails, the entire sealed beam is replaced rather than an internal bulb.
The H5001 is a 4-inch square sealed beam unit designated for the high beam headlight position on the Road Runner across the 1968-1974 model years.
The H5006 is a 5.75-inch round sealed beam unit designated for the low beam headlight position on the Road Runner across the 1968-1974 model years.
The 1975 Plymouth Road Runner departs from the dual-unit configuration used in prior years. Both the high beam and low beam positions use the same H6024 unit, a 7-inch round sealed beam, for that model year.
Because the H6024 serves both beam positions in 1975, it is a physically larger unit than either the H5001 or H5006 used in earlier years, reflecting a different headlight housing configuration for that model year.
The H5001 and H5006 are not interchangeable with each other despite both being sealed beam units. They occupy different positions in the headlight assembly and carry different size specifications, making position-specific fitment a relevant consideration during replacement.
The H6024, H5001, and H5006 are each distinct ANSI-coded units, and substituting one code for another would result in a size or beam-pattern mismatch incompatible with the intended headlight housing.