I'm about to purchase a 2004 320CDi S Class. I've found some on the internet with xenon headlights but when I asked the dealer on the phone if these are standard he couldn't tell me. Are these xenon headlights standard on this 2004 model or will I need to upgrade? May seem a silly question but I'd like to know. I called the local MB Dealer but they showed little interest as I was not buying from them.