Keep in mind.. The grilles in 69 mostly were made of metal by going to plastics in 70 they had multiple issues for endurance.. Mainly the grille mounting points under stress would develop cracks. Early plastics did not hold up well for exposure to the sun...
Just my $0.02...
Plastic won't hold up very long on any car but let it float in the ocean and it will last millions of years.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
