Yup that's the one, mine has a circular rubber gasket that fits around the tail pipe and then into the hole in the wing, its that rubber gasket that has worn away and broken
i would say that's the better approach mine seems to need the rubber to stop it falling out as it did, the other issue is it started to bubble the paint work during the period i did not notice that it was up against the bodyworkAre right i don't have one on mine as the hole is slightly bigger than normal on mine and the tail pipe doesn't touch.