These are all shots of the optional far rear panels that house the factory jack and lug nut wrenches, etc. These panels do not need to be taken off to replace speakers in rear, but doing so does give you more room to work with. Unlike the panels that cover the speakers however there panels have a few fasteners that need to be removed before it pops out from the pop tabs. Here are the locations of the screws, etc.
This is the reason that these far rear panels feel like they are so firmly in place, each far rear panel has these two bolts holding them in, and these bolts are only accessible after you have popped most of the panels that cover the speakers out of place:
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