I bought a cabin air filter for my 2009 A4 Cabriolet, the one with the angled corner. I found several how-to videos on youtube and every video shows the same three screws, remove foam cover, slide door, remove and replace filter. Mine looks nothing like the videos. I have a plastic piece with a light in the middle of it under there. I found the pollen filter under the hood. Does the convertible not have the inside cabin filter?