The Saab 99 uses an H5001 bulb size for high beam headlights and an H5006 bulb size for low beam headlights. The replacement chart covers vehicle production years spanning 1975 to 1980 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 Saab 99 uses the H5001 sealed beam unit for high beam headlights across the 1975-1980 model years, and the H5006 sealed beam unit for low beam headlights across the same range.
Both the H5001 and H5006 are ANSI-standardized sealed beam units, meaning they conform to a fixed North American specification used across multiple vehicle manufacturers in the United States and Canada.
The H5001 is a 4-inch square sealed beam unit operating at 12 volts. Because it is a sealed beam design, the lens, reflector, and filament are fused into a single glass unit rather than housing a separate replaceable bulb inside.
The H5006 is a 5.75-inch round sealed beam unit, also operating at 12 volts and sharing the same sealed construction as the H5001, where the entire assembly is replaced as one piece when the filament fails.
The physical difference between the H5001 and H5006, square versus round housing, means the two units are not interchangeable with each other, as each occupies a distinct mounting position designed for its specific shape.
Because both types follow ANSI standards, replacement units sourced from different manufacturers are generally cross-compatible as long as the correct ANSI designation matches, provided the replacement also meets the 12-volt rating.