This knob switch is designed for use in Mercedes-Benz vehicles including W204 C250 C300 C350 C63 AMG, X204 GLK250 GLK350, and W212 E350 E400 E550. It is an original OEM part with OE/OEM part numbers A2049020501, A 204 902 05 01, A 204 902 0501, A 204 870 9758, A 204 870 9858, 2049020501, A 204 870 98 58, 2048709758, A2048709858, 2048709858, A 204 870 97 58, and A2048709758. The knob switch is perfect for controlling the radio, navigation, and multimedia functions in your vehicle. It is manufactured in Germany and is of the highest quality.