0169972948 Transmission Filler Tube; O-Ring for Transmission Filler Tube
NO O-ring size was given.

When I looked at one of the russian part sites you need to know the transmission number in order to bring up the correct Transmission to look at the parts. They are not listed by vehicle.
The one pic I looked at showed 4 different tubes but only 2 O-ring so I guess the O-ring works on all.
The Diesel Giant sight shows where to find the Transmission Number. Mine is on the passanger side and it is hard to see because of the Exhaust Pipe.

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84 300D, 82 Volvo 244Gl Diesel