What’s this hole for? 66 Dart

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Slantsix64

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It’s on the firewall. What would have gone through there?

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I'm gonna take a WAG and say it's for a bulkhead plate or grommet for a pass-through on an aftermarket air conditioning system.
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This one's for a 1 1/2" hole- is that about right?
As said previously- whatever it is, it ain't factory. At least for anything I've ever seen.
 
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Hmmmm, there was nothing AC on this car. The hole looks like it was stamped out rather than a hole saw or something. I’ll check in the inside of the cab to see if the insulation was torn out the way
 
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