I wonder if it would be worthwhile for someone to buy Viton O-rings of the right size to sell to Shopforum members? This isn't a "get rich" scheme, as anyone can buy OE rings from Mercedes at a minimal price. These have to be one of the cheapest items in the entire car, but of fairly high importance. If you want to keep oil pressure in the proper range and have an assurance that oil will flow through the filter as it is supposed to then these 2 little rubber rings are critical.

For someone who wants "the best" O-rings made from Viton would be ideal and it probably won't cost much more than regular ones.

FYI. I just spoke with an associate that used to buy O-rings from Apple Rubber Products in Lancaster, NY. He doesn't know what their minimum order is. Their tel# is 1-800-828-7745 in case anyone wants to run call them for a quote. I am willing to buy a dozen myself.
The only two measurements necessary are the ID and the wall thickness. The OD is a result of the other two dimensions. So a 6.0 mm X 2.0 mm might be right. Can someone mike one and see.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!