Extra hole in tail light panel 68 Charger RT?

[Michigan Racer]

As I was sanding the tail light panel I noticed a round crack in some old body filler. As I sanded a piece of body filler came out revealing this extra hole low left of the trunk key opening. Not sure what its purpose is? Anyone know what this is for?
Thanks!

 

[pnora]

Two quick things come to mind. Kill switch for racing. Trailer tow plug.

 

[SGTPaul]

Not normal / factory.

 

[RemCharger]

Yep the old 4 pin flip lid trailer plug comes to mind.

 

[hunt2elk]

Weld it up.

 

[Michigan Racer]

Thanks for the response! The trailer plug makes sense, never gave that a thought. I’ll weld a plug in it. Must have been a factory option that they just covered up on those who didn’t order that option.