Mercedes-Benz GLC63 AMG S high beam and low beam headlight bulbs both use H7 size for replacement. The 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 positions and years for the Mercedes-Benz GLC63 AMG S, appearing in both high beam and low beam headlight applications.
The H7 is a single-filament halogen bulb operating at 55 watts on a 12-volt system, housed in a PX26d base configuration, which is a two-pin bayonet-style cap.
Both the high beam and low beam positions share the H7 specification across the 2018-2020 model years, meaning the same bulb type serves both functions in this vehicle.
The 2020 model year carries a conditional notation specifying H7 fitment applies only to vehicles equipped with Halogen Capsule Headlamps, indicating that not all 2020 GLC63 AMG S units use this bulb type.
The 2018-2019 model years carry no such conditional notation, meaning H7 fitment for those years applies without a stated headlamp system qualifier.
The Halogen Capsule Headlamp qualifier on the 2020 entries is a fitment warning of practical significance, as installing an H7 bulb in a vehicle equipped with a different headlamp system, such as LED or bi-xenon, would be incorrect and potentially non-functional.
The H7 bulb format is not interchangeable with other common automotive halogen types such as H4, H11, or H1, as each uses a distinct base configuration and pin arrangement that prevents cross-fitting.