Chevrolet Biscayne high beam headlight bulbs use H5001 size while low beam headlight bulbs use H5006 size. The replacement chart covers vehicle production from 1958 to 1972 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 Chevrolet Biscayne uses the H5001 sealed beam unit for high beam headlights across all model years from 1958-1972, with no variation in specification throughout that entire production span.
The H5001 is a 4-inch square sealed beam unit operating at 12 volts. It conforms to ANSI standards recognized in both the United States and Canada.
Low beam headlights on the Biscayne are specified as H5006 across all model years from 1958-1972, matching the consistency seen in the high beam application.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12 volts and conforming to the same ANSI standards applicable in the United States and Canada.
Both the H5001 and H5006 are sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly. When a filament fails, the entire unit requires replacement rather than an internal bulb swap.
The H5001 and H5006 differ in both shape and size, making them non-interchangeable. The H5001 is square at 4 inches, while the H5006 is round at 5.75 inches, and each occupies a distinct housing position dedicated to its respective beam function.