Mystery Hole

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Anyone know the purpose of this hole on the door pillar? There’s one on each side. I suspect the hole on the passenger’s side is for the antenna. Drivers side?

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Correct, the passenger side is the antenna cable port. The driver side on my Mach has this factory installed rubber plug.
 

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My car had rubber plugs in both sides in those holes and there is a smaller hole that the antenna cable went through. The grommet on the cable is the same size as the smaller hole facing forward.
My car had a third much smaller hole that had nothing in it when I bought it. I am not sure what that is for, I think it might be something the PO just drilled for some reason.
 

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I wonder if it was an indexing hole for the welding jigs on the line? They look reason I as asking, in part, is because, while it’s difficult to see in the pic, the hole on the drivers side looks like it was deformed by something; it’s no longer round. I’ve got the rubber plug set from NPD on my list, so hopefully both holes will be plugged in the future.
 
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