Mercedes part numbers can be found by you here: http://epc.startekinfo.com
A basic lesson in German car ownership is that one doesn't shop for parts down to Pep Boys or NAPA. German vs 'merikun cars is apples/oranges.
Thank you VERY much for that suggested part number source. It is much appreciated. Unfortunately, as with everything Mercedes "Factory" or "Dealership", they want money. Specifically, everyone to pay $3,000.00 (three thousand US Dollars a year) a year, (they will accept credit cards) to get a part number, at the site you recommended. that's a bit steep to get the part number for a $1. light bulb, for me.
With regard to NAPA / PEPBOYS...
1) I am unable, now or ever, to pay $20 for a .50 cent bulb, just because it's from a dealer. A basic lesson in getting 2 weeks vacation vs filing Chapter 11.
2) The quality and speed of service and assistance received is superior at NAPA and PEPBOYS and AUTOZONE vs all the Mercedes Dealerships I have ever gone to.
3) The quality of the parts can be very comparable, or often better, if you pick the more expensive of the 2-3 price ranges offered for parts by NAPA, etc.
4) The 'special order' time for parts (2-3 hours, free NAPA, etc) vs a week and, sometimes a shipping charge, at the dealership, is much more inviting.
5) The Dealer representation of 'absolute' requirements, expenses and time is so
distorted ($1,800. and a week for a full brake job including new rotors) vs. $215 and 2 hours through NAPA, etc, and DIY, that I am permanently disuaded from getting anywhere near a dealer unless all else fails.
Thank you again for that Parts List Source. It could have saved me a lot of time, effort and expense, but not at a $3000. subscription. Thomas