carl n susan, thank you for telling me the correct term for "mushroom vents" (they look like mushrooms). We had a water leak in our rear LR. CW advised us we lost the top to the "air vent". CW replaced the top, no more leaks. I replied to a previous post on the forum about our water leak & called it an "air vent" which was a questionable term. Hey ya'll it's a mushroom vent.
https://www.amazon.com/d/Automotive-...room+roof+vent