Hey Jim .... I know nothing about ZF transmissions , but if it is just an "O" ring , you might be able to match it up at a local Mill Supply house or with someone who represents/sell Parker "O" rings . If you can get it out , they should be able to get the cross section and diameter . Durometer is something you might have to guess at . Most of those places also carry metric stuff . Maybe consider going to Viton if temps are a problem . Do NOT go to Teflon as it has no memory and will cold flow on you .
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