also, incidentally, I have never known the 70 & 71 grille emblems to be differentiated - but maybe I just missed this factoid...
The NOS 69 emblem I have here has on the back a casted in number 9788859;
This 70 emblem has on the back a casted in number 480863
I hope this helps
And If you are interested in buying one of my spare emblems, I can see if I have the little brackets to go with it.