Compatibility and replacement - This sequential mirror side marker lights are compatible with Mercedes-Benz models: 2008-2014 W204 C-Class, 2010-2016 W212 E-Class, 2007-2014 W221 S-Class, 2013-2019 C117 CLA-Class, 2011-2018 W218 CLS, 2010-2015 X204 GLK, 2014-2019 X156 GLA-Class. Replaces OEM part numbers A2129067501 and A2129067401. Easy installation - Plug directly into the original connector, no coding required. Perfectly replaces factory OEM left-hand and right-hand side mirror turn signals with no modification. Just remove the cap cover and replace the entire assembly. Durable and weatherproof - Made from high quality ABS plastic with a lens processed by ultrasonic treatment. Anti-scratch and resistant to long-term fading. Designed to withstand extreme weather and prevents condensation after heavy rain or car wash. Performance and style - Sequential LED lighting delivers clear signaling for increased safety and a premium Euro style look for your Mercedes-Benz. Practical use scenarios - Replacing worn or damaged factory mirror indicators during maintenance or aging components on the listed models. - Upgrading to bright sequential LED indicators for better visibility in urban and highway driving. - Restoring factory look with a plug-and-play OEM replacement that requires no wiring or coding.