I've got to second the "painting" option.. actually finding someone with an OEM vinyl Pinto sticker kit that isn't petrified or is still workable.. is likely all to much like trying to find an original, still-crated, complete- 426 Hemi/Mopar Engine.. ("if" you do find one, it will be far from cheap..)
If you simply don't wish to go the 'paint' route, you could always just pick up the roll sticker vinyl & razor it on yourself.. I'll wager you'd do a better job than Ford did originally..
Michael