First, welcome to "club". Second, your car is practically a part number. By that I mean, just about every part in the car has a part number on it. MB part numbers are xxx xxx xx xx. Look at the oil filter housing cover, you will 617 xxx xx xx. This would be the MB part number for the oil filter. As for a parts breakdown goes, you would have to call a dealer to inquire. I e-mailed MBUSA about getting one for my '83 300TD and was told to go through a dealer.
For your hose from the air filter, which BTW is called a breather hose, look carefully, you should see a part number. Basicly anywhere you see a star, it is followed by a part number. Even that little rubber elbow that attaches this breather house to the valve cover, has a part number on it. That to starts with 617. BTW 617 is the engine series number for the 5 cyl., turbo diesel engines.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member