Mechanic Q: Where is the oil drain plug in a 2005 Mercedes C230 Kompresso 4door Sport sedan?

I'm having a hard time finding the oil draing plug.

Mechanic Q: How can I get a diagram for the front/rear suspension??

I had the car inspected and was told to buy some parts, some of these parts where the front suspension plates, for which I can only find to entire plate, and its to expensive. Are the bearings sold separate. Do you have a complete front and rear suspension kit that I could purchase. I already replaced the link kits, the outer and inner bearings and booths on the front of the car.