The Buick Wildcat 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 1962 to 1970 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 Buick Wildcat uses the H5001 sealed beam unit for high beam headlights across all listed model years, 1962-1970.
The H5001 is a 4-inch square sealed beam unit operating at 12V, conforming to the ANSI standard recognized in both the United States and Canada. As a sealed beam design, the entire unit is replaced rather than an internal filament or bulb.
Low beam headlights on the Wildcat use the H5006 sealed beam unit across the same 1962-1970 model year range.
The H5006 is a 5.75-inch round sealed beam unit, also rated at 12V and built to the same ANSI standard as the H5001. Like the H5001, it is a non-serviceable unit requiring full replacement when it fails.
The H5001 and H5006 are physically distinct units. The H5001 is square while the H5006 is round, and their sizes differ, making the two types non-interchangeable between the high beam and low beam positions on the Wildcat.