Yeah Bruce. Feed it thought there. If you can't manage to squeeze it through with the other wires (which most of the time you pretty much can't), then poke a hole in the flat section of the grommet a couple of centimetres away from the bulk of the cables. Poke a coat hanger through there (can even use the coat hanger to make the hole), and then look for it inside the car. Once it is all lined up, tape the cable to the coat hanger and feed it into the hole. Carefully pull it though into the car (helps to have someone outside feeding the cable to prevent it coming loose), and then you are set. Once everything is all in the right place, if you want to be picky, put some silicone sealant around the hole you made on the grommet.