Lincoln Mark II high and low beam headlight bulbs utilize H5001, H6024, and H5006 sizes depending on beam type and configuration. Replacement chart data covers 1956 to 1957 vehicle production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lincoln Mark II uses sealed beam headlight units across both model years covered in these specifications. Sealed beam units integrate the filament, reflector, and lens into a single assembly, meaning the entire unit is replaced rather than an individual bulb.
All three sealed beam types listed, the H5001, H6024, and H5006, operate on 12 volts and conform to ANSI standards recognized in both the United States and Canada.
The 1956 Lincoln Mark II uses the H6024, a 7-inch round sealed beam unit, for both high beam and low beam functions. A single unit type serving both roles indicates a single-headlamp system for that model year.
The 1957 model year introduced a split headlight configuration, with the H5001 assigned to the high beam and the H5006 assigned to the low beam. This reflects the dual-headlamp system that became federally permitted in the United States in 1957.
The H5001 is a 4-inch square sealed beam unit, a form factor distinct from the round units used in the other positions. Square sealed beam housings are not interchangeable with round housings regardless of voltage compatibility.
The H5006 measures 5.75 inches in round format, while the H6024 measures 7 inches in round format. Although both are round sealed beam units operating at 12 volts, the difference in physical size makes them non-interchangeable.