The Mercedes-Benz SLK350 headlight bulb specifications include D1S, H7, and D2S sizes depending on beam type and model configuration. The replacement chart covers 2005 through 2016 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H7 is a single-filament halogen bulb rated at 12V and 55W, fitted with a PX26d base. It carries ECE approval for use in Europe and worldwide markets, and is also approved for use in the United States and Japan.
The D1S and D2S are both HID (xenon) discharge bulbs rated at 85V and 35W, designed for projector-type housings. The key distinction between them is that the D1S incorporates an integral ignitor within the bulb itself, while the D2S requires a separate external ignitor.
The Mercedes-Benz SLK350 used the D2S for the low beam on HID-equipped vehicles from 2005-2011, while the D1S replaced it for the low beam from 2012 onward. These two bulb types are not interchangeable due to their differing base configurations, PK32d-2 for the D1S and P32d-2 for the D2S.
On the SLK350, the high beam position used only the H7 from 2005-2011, regardless of headlamp type. From 2012-2016, HID-equipped vehicles used the D1S for the high beam as well, while halogen-equipped vehicles retained the H7.
From 2005-2016, halogen-equipped SLK350 vehicles used the H7 for both high and low beam positions, making it the single bulb type that spans the full production range covered in these specifications.
The D1S base designation PK32d-2 and the D2S base designation P32d-2 reflect physically different connector configurations, meaning a D1S bulb cannot be seated into a socket designed for a D2S, and vice versa.
For 2011 SLK350 vehicles, the high beam position listed only the H7 with no HID variant, while the low beam listed both the D2S for HID systems and the H7 for halogen systems, indicating the two headlamp positions did not share the same bulb type on HID-equipped vehicles that year.