Partsam 4pcs Error Free Eyebrow Eyelid Light Led Bulbs Mercedes Benz C300 C350 C63 AMG Bulb Size: Length: 29mm, Width: 10mm; Built-in Circuit for 12V DC Power Input; Each bulb 5 pcs 5050 SMD LED 360 degree light output; Built-in CAN-bus controller, no bulb out error, no flickering; Cross reference parts#: T10 168 194 W5W etc. Cross Part Number: 158,161,168,175,194,558,579,T10,280 285 447 464 555 558 585,1252 2450 2652 2921 2825 921 906 579 IMPORTANT NOTICEPlease make sure your car circuit is working well before installation, as the bulbs will be burn may occur if there is a current spike or volte leak in your vehicle after the new bulb installed, it is not the issue of Partsam product quality. Notes: (1)Don't forget Risistors if flashingBlinking or Code error problems occurrs.(2)If you bulb does not light or occurrs blinker, please check if your relay is broken and whether your socket is senescent or not. Please double check the compatibility before placing the order.