Unfortunately you can’t rely on the Signature anymore. With the new web site they don’t show up unless you press the button that says “Show full Signature”
If you buy a set of the assembly manuals they do a good job of showing what goes where. I have a set of 66 and 68 manuals. Maybe someone else has a set for the 67. They are really helpful when working on these cars I have found.
It's a '67, I'm more concerned about the large hole in the upper front apron. I have the Osborne manuals but can't find any reference to it. It may be the same size as the seat bolt holes, the hole is about 1.5" in diameter.