From what it looks like, you're pointing at the "kick panel"
I usually have a look on yearone/summit/ogpi etc and try decipher what the yanks call each part - heaps of things seemingly have well different names to what we'd call them.
If you need any steel parts, I cant recommend Retroautoparts thoroughly enough - you can pick up the Parts or he'll bring them in, generally for less than the cost of the Parts online overseas.
Must be some good F-Body groups on facebook to join too for advice?
Thats a big 10-4 Snowman lol