The Opel 1900 uses H6024 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1971 to 1975 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6024 is an ANSI-standard sealed beam unit used in both the high beam and low beam headlight positions of the Opel 1900 across the 1971-1975 model years.
The H6024 is a 7-inch round sealed beam unit operating at 12 volts, conforming to ANSI standards recognized in the United States and Canada.
Unlike bulb-based headlight systems, the H6024 is a sealed beam unit in which the lens, reflector, and filament form a single assembly, meaning the entire unit is replaced rather than an internal bulb.
The use of the same H6024 specification for both the high beam and low beam positions indicates that the Opel 1900 used a dual-lamp headlight arrangement, where separate units handle each function rather than a single multi-filament lamp.