Congrats on your purchase. What chassis is the car, W126? As for oil filters, I would go with the Knecht. Nothing against Bosch, but when I think of Bosch. I think electrical parts not filters. I have ordered oil filters for my diesel from a dealer and it had both Mercedes-Benz and Knecht names on it. Another filter brand to consider would be MANN. See what is available for you car at Fastlane, and pick from there.
I don't know what a "oil filter stand gasket" is, unless they are talking about the gasket for the filter lid. Though, if you buy a oil filter "kit", it should come with any new gaskets required.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section