You can also find much of what you asked about in the "1967 Mustang Electrical Assembly Manual" (AM0018) pg50, and fog light alignment instructions on pg 51. A page is missing that shows under dash wiring. There is also "Ford Car Parts" (aka MPC) available in this forum's library that should have the under dash details. Included in all those drawings are Ford engineering part numbers, Ford hardware part numbers and Ford service stock numbers.
If you do not have a set of Mustang Assembly Manuals for your car you should consider getting a set. (Get the paper instead of the disc. You can write notes on the paper version.)
Jim