Edit:
For further clarity, I found this part in one of my Novemeber 1974 print date Firebird Master Parts Catalogs here;
Group 12; Illustration 6; item number 39;
Panel Assembly; Shroud vent duct - side: 12.804
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Quote:
12.804: Panel, Shroud vent duct side;
1) 8782297 8782298 1970-75/all-primed
12.804: Panel, Shroud vent duct side and weld nut;
1) 9739594 9601757 1970-74/all sup 9739686-RH
1) 9739594 9739595 1975/all-primed
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These are listed like this in my MPC, I am guessing that the second listing only differs from the first in that it has included the weld nut which I believe is for the bottom/rear fender bolt.
The weld nut can be seen in all three attached pictures from my prior post (you would be correct if you guessed that the fender bolt broke in the weld nut).