Steve, thank you for the links. I realize that a simple question calls for a complicated answer!
Nevertheless, I chose to try the GF124 AC Delco. It seems shorter than the SNG's, so could possibly fit into the bowl
As for the originality of my filter and bowl, I am not sure at all. And I can't remember if the (paper) filter was in the bowl when I got the car. As a matter of fact I can't find it back today. However I found a brass filter mesh in the filter head.
Pierre's DIY would be a last chance solution.