AFS Front Headlight HID Ballast Gas Discharge Lamp Xenon Ballast Control Unit for Mercedes Benz E CLASS T Model S211 W211 HEL|Car Light Accessories| - AliExpress
Mercedes E-Class W211 Xenon ballast – RetroFit Lab Blog
For Mercedes E Class W211 S211 03-09 HID Xenon Headlight Ballast Control Unit | eBay