You have to remove the whole lower panel (see here, http://www.mazda3forums.com/index.php?topic=26798.0), and then the blocks just unclip and slide out. Then take the cover off the blocks and do what you will. It's really pretty easy once you get the whole panel off. And be careful getting the hood release off, I managed to snap the lock off and now if I pull the release it can come out of the slot.
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