What's this?

Newbie question. Having trouble identifying this thing in the interior. It's located on the driver's side foot well, on the side closest to the door. I don't have an owner manual to reference, I wasn't able to find one online, and the service manual I have is roughly 800 pages so while it may be in there, in my quick thumbing through of it, I wasn't able to find anything. I tried searching here, ebay, google, and youtube also with no luck. Any help would be appreciated! I'm new to these a bodies and mopars in general. Thanks!

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