Does this Turbocharger O-Ring go to the lid of the air cleaner housing? The description found from here says "Air intake pipe to air filter housing"

http://www.allpartsexpress.com/item.wws?sku=MBZ021272

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1984 300D Turbo Diesel

I think I figured it out but not 100% sure. This is the Grommet on the lid of the Air Filter that the Blowby Tube goes through.

The Auto House place has the same picture and has: The Mercedes part Number 6170980265 Turbocharger Seal; Grommet, Air Intake Pipe to Air Filter Housing

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84 300D, 82 Volvo 244Gl Diesel

I agree.

Definitely doesn't look like the o-rings used for the U-tube between the air filter housing and turbo.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

I thought so, but why is it called "Turbocharger O-Ring"? I had a hard time finding it from the parts catalog .

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1984 300D Turbo Diesel

Ha I found it:
6170980265 Air Cleaner cover Grommet OM617

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84 300D, 82 Volvo 244Gl Diesel

Thanks Diesel911 and sd300td. I also found this picture from this forum. Just posting this for people who search in the future.

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1984 300D Turbo Diesel

I got the part but it is too small for the hole on the lid. Is there a similar grommet but bigger, for other model? May be previous owner got the lid for other model. Just guessing.

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1984 300D Turbo Diesel