Unfortunately, I didn't save mine, but the Mustang Monthly Magazine ran such an article in one of their past issues a few years ago. It showed the proper location, with exact measurements, of all emblems for 64-73. I needed it when I ordered my reproduction trunk lid which didn't come pre-drilled for the "MUSTANG" letters. You might try their web site (
www.mustangmonthly.com) and see if you can somehow get a copy of that issue (believe it was a 2 part story over 2 months).