I wasn't aware that 2 filters are present. The picture below
show the location of the old filter and the new filter (made by Bosch in Spain - part number 1 457 434 123). The filter has 2 gaskets (should I call them o-rings?): the small one has an ID of 12mm and an OD of 21mm, the larger one has a ID of 61mm and an OD of 70mm. Is there another gasket (o-ring) which needs to be changed as well?