1965 Formula S (with A/C) Ballast Resistor Location?

Re: The vacant hole in post #11:

The vacant hole (that is made with a dimple) that is next to the fastener in the photo is for a plastic firewall nail to secure the insulation pad on the inside of firewall. For certain it is used to secure pad for A/C equipped vehicles (not sure if present/needed for non A/C applications).