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Do you mean the Toyota Corolla?
https://en.wikipedia.org/wiki/List_of_best-selling_automobiles
I think if you consider model continuity, the Beetle is still the best-selling car. In recent decades, models like the VW Golf have been changed so much that they've really been many different cars, and the only thing that sold so much has been the name.
No idea which model has the greatest number surviving, though.
Isn't this the most ubiquitous car or something, too?