Car speakers are usually designed to need the airspace of the door, be careful using these as you are likely to actually hurt SQ. They are certainly no substitute for liberal amounts of deadener on the door skins.Water will always manage to get between the rubbers and the window glass so any water that does make its way in is supposed to drain through small holes at the bottom of the door. Get down low and take a look. It would be worth cleaning these out to make sure they havent become clogged with dirt over the years. When I replaced my speakers recently I also fitted these baffles behind them. Not only will they protect your nice new speakers from getting wet they are supposed to improve the sound quality.
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They tend to be used as a band aid for poorly sealed doors or poor installations. The G front doors however are excellent for audio - well sealed and a solid base for the driver (and great tweeter placement). And good quality car audio speaker will perform better with the airspace of the door and these foam cup baffle things will just kill mid bass performance.
But used as an "umbrella" with the bottom half cut away they can be useful. Rigid ones are better though.
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