??? Firewall Hole(s) question ???

[E911manager]

I am looking at the firewall and trying to decide what I can fill and what I need to keep open. I intend on putting in a vintage air type AC unit that uses one of these holes or another. Can someone attach some pictures of their firewall so I can see what all these holes are for?

I am particularly concerned about number 1 in the picture. That would a a big grommet if I dont use it later. I think the top heater box hole is the one used by the vintage air kit for the lines. If not do they supply a delete cover with the it. Anyway pics would help a lot..