1971 Dart swinger FENDERS - Late production

was there a January 1, 1971 law that fenders had to have crumple zones? My early fenders have nothing on the inside edge where the hood meets the fender between the rubber bumpers. this photo is from a 1972 Demon and you can see the upside down triangles near the fender mounting bolts.
I am looking for a mint pair of late Demon /Dart fenders WITH the upside down triangles. prefer no body side moldings.
call/text photos 860-4168434IMG_0091.JPG