Firewall plug cover?

Fireguyfire

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I was poking around in a box in the trunk of my 70 300 if “extra” parts that came with the car, and came across this.
If my mind serves this is a cover or “roof” piece over the firewall wiring plug centre ?
If so, how does it mount in place, and if not any guesses on what the part is?

B8E6840E-DBD0-4354-B2E1-8B63276AFD6D.jpeg
 
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