ok, so I have dug a little further into this.
My master parts catalog shows some curious tidbits of information;
(print date November 1974)
Quote:
485602 1967-1969/ALL - PONTIAC /SUP 9878859
481547 1970/ALL - PONTIAC
483933 1971/PONTIAC
487732 1972/PONTIAC EXC TRANS AM
487735 1973/PONTIAC
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I included all 67-73 numbers so that you can see how they are originally listed.
Firstly, 1971 used the exact same grilles as 1970, and to the best of my understanding the emblem was called to be installed in the exact same location - so I am unclear why they are different part numbers.
I wanted to speak about the 1967-69 emblem, because it is available as a reproduction;
I bought one a short while back, except mine is not a reproduction, it is an NOS emblem that came with the parts ticket, in the older blue (not brown) GM box.
I grabbed one of my spare grilles which has the 70 emblem installed to compare the two:
Without removing the 70 emblem, the 67-69 emblem appears to be a near dead ringer;
The tiny grille locating studs behind the "T" appear to be in exactly the same spot;
The longer studs behind the "C" & "P" are almost perfectly in line with the '70 studs - but it appears as though the 67-69 (lets call it a 69 emblem from this point forward) has the stud behind the "C" set a little higher - the 69 emblem has the stud in line with the "-" in between the "A" & "C", while the 70 emblem has it set lower on the "C", with a tiny locating stud just above the "-".
On the other end of the emblems (at the "P"), the 69 emblem has two tiny locating studs, while the 70 has one - but the top 69 stud, is in the same spot as the one used on the 70 emblem.
The mounting stud (uses a nut) on the 69 emblem has a cast shoulder on it which may need to be trimmed back (a file should do the trick)...
Now, lets pause for a second;
The emblem itself is actually one half of the puzzle;
The other half is the little mounting brackets that the nuts sinch up against.
If I leave the brackets where they need to be on the 70 grille to mount the 70 emblem, but try to install the 69 emblem, it mounts almost perfectly with no modification in the correct spot.
I have tried to picture this for you...
here are the two beside each other:
Here is the 70 emblem held in place with the brackets:
Here is the 69 emblem held in place - with the 70 brackets where they are supposed to be:
The only obvious difference is the location where the "C" stud pokes up.