Looking up from engine bay towards rear window opening (in the center) and right and left side?

I don't think it was the firewall pad. Those were held in place with metal tabs?

Anyone?

Not sure about the second pic hole but the ones in the center in your first pic don't look factory. What year is that tub?

I don't recall having them on any of my cars ...

The firewall pad was held in the metal tabs and three plastic push in retainers. But the holes for those were lower down. Those holes are factory and have no purpose.

'75. There from the factory

Thanks Mark

Optional factory lightening holes