Hi, I have a Mercedes A-Class 140 2003. Two questions: 1. Does anyone know where I can pick up a 15" hub cap with the Mercedes symbol in the middle? One of mine fell of or got stolen, not sure which, I have trawled the web without any success. 2. My car sounds like a transformer with a dying battery when I lock and unlock my car, the humming noise goes on for ages, can anyone tell me what this could be and if it will be expensive to fix?