Thanks.
Finally I managed to find one (in a Sunny) after a lot of searching. The other one has been replaced by a simple closed grommet (dia 38mm) after punching a tight hole on it for the cooling hose. At the left side it is almost invisible because of the brake master cylinder. It looks quite good but the Nissan part is better, that is perfect.
I checked some car breaker yards for another Nissan grommet but they were not so helpful. A rubber grommet is a cheap shit for them, not a good business. It was not worth opening the bonnet - they thought...