The Mercedes-Benz 230S uses an H5001 bulb size for high beam headlights and an H5006 bulb size for low beam headlights. The replacement chart covers 1966 through 1969 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 Mercedes-Benz 230S requires the H5001 bulb size for high beam headlights across the 1966-1969 model years.
The H5001 is an ANSI-standard sealed beam unit, recognized in both the United States and Canada, operating at 12V with a 4-inch square form factor. Because it is a sealed beam design, the entire unit is replaced rather than an internal filament or bulb.
Low beam headlights on the 1966-1969 230S use the H5006 bulb size.
The H5006 is also an ANSI-standard sealed beam unit operating at 12V, distinguished from the H5001 by its 5.75-inch round form factor. Like the H5001, the complete unit is replaced when the light fails.
The physical shape difference between the H5001 and H5006 means the two types are not interchangeable. The square 4-inch H5001 and the round 5.75-inch H5006 occupy distinct housings designated specifically for high beam and low beam positions respectively.
Both sealed beam types conform to ANSI standards, which defined fixed optical and electrical performance requirements for sealed beam headlamps during the period these units were in common use in North American markets.