Got a new freeze plug from the dealer, unfortunately the correct O-ring needs to come from Germany. Is there anything specific about this MB-ring, or can I just use a generic one from the shelf?

__________________
1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).