Hi LugNut,
Thanks for the great article and pictures. I just replaced my reservoir this weekend without a hitch. Took about 2hours while I was watching a football game. I got my reservior from the link you cite. The interesting thing is I called them to see if it was in stock. They told me yes, and it would be around $90. I ordered it giving them my VIN number. They then email me that they are replacing it with the Mercedes part, and the cost would be around $28 plus $12 shipping. The reservoir came, fit perfectly, and cost me $60 less than I thought it would. I have a 2005. My wife also has a 2005, but her reservior is still going strong. So, I decided not to add the washer under the reservoir as suggested above. We'll see how long it lasts. Thanks again.