those foam cups might get you about the same volume as the displacement of the driver, not nearly enough.
For me, I'm incorporating half the door pocket (it's hard plastic on mine, and will cut in half so I can still store stuff in it) as well as some parts of the door molding to make sure I get about 0.3 cubes. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif