Not a Ford document but what I found so far.
Marty : While not a Ford document (looks like it came from a 1968 Illustrated Facts booklet), its contents appear to have come from a Ford document ; a 1968 Color and Upholstery Book to be exact.
While I don't have a 1968 C & U Book, I do have a 1967, and I have attached a copy of a similar page from it.
As I noted to Jeff in an earlier thread as to where some information originated, the original publishers grabbed information on just Mustangs from Fords "All the Facts" Books/ Binders, and lumped it together in booklets and called them "196x Mustang Illustrated Facts", doing this for each year. Obviously, they also included "cuts" from the C & U books. And of course being a time before Ford Licensing came into play, but not risking any copyright infringement issues, the publishers never referenced from where the information originated.
Bob