Ya know, mine fell off a few months ago and I drove with it rattling around back there... Drove me nuts. I finely stopped being lazy and fixed it. Used some harbor freight rivets and pinned that thing back up. It's working for now I may just rip the thing out if it falls down again.
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My Focus (My Car)
2011 SE (4 door) with 5 speed manual, 115,000 Miles
Our Focus (Wife's Car)
2015 SE Sedan 5 Speed Manual, 35,000 Miles