This is an old school NOS Ford brake pedal pad which is correct for all 1965 through 1973 Mustang models equipped with the 3 or 4 speed standard transmission.   This pad is highest level show quality correct, you simply can not purchase a more correct pad anywhere.   The repros are mostly made in India and are, of course, not correct.   You can tell by the package that this pad was made by Ford many years ago.