Mercedes-Benz GLC63 AMG high beam and low beam headlight bulbs use H7 size. The replacement chart covers 2018 to 2020 production years with bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H7 bulb is the sole bulb type specified across all listed years and positions for the Mercedes-Benz GLC63 AMG, covering both high beam and low beam headlight functions.
The H7 is a single-filament halogen bulb operating at 55 watts on a 12-volt system, housed in a PX26d base configuration with two offset locating tabs that fix its rotational position in the socket.
For the 2019-2020 model years, the H7 fitment is explicitly conditioned on the presence of Halogen Capsule Headlamps, indicating that alternative headlamp systems on those vehicles use a different bulb specification.
The 2018 model year carries no such conditional note for either beam position, listing the H7 without a headlamp-type qualifier.
Because both the high beam and low beam positions share the H7 designation across all listed years, the vehicle uses a projector or reflector housing design that relies on separate single-filament bulbs for each function rather than a dual-filament unit.
The PX26d base of the H7 is not universally interchangeable with other common halogen bases such as the H4 or H11, and substitution with physically similar bulbs risks incorrect beam alignment or socket incompatibility.
The conditional Halogen Capsule Headlamps notation on the 2019-2020 rows serves as a fitment warning, as installing an H7 bulb in a non-halogen housing variant would be an incorrect application.