Evidently they are called "pierce nuts" and are pressed in at assembly (according to some posts on a Chevelle forum). They look like this pic, tho I have not been able to find any in a 3/8 - 16 thread. I should mention that I do not know if my fenders are OEM, I learned the hard way the man who did the original resto took some different paths than I might have chosen, so please confirm thread size on the 67. Again, good luck.
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Fort Worth/Dallas TX area
1966 GTO Fontaine Blue
389 CID Carter AFB
Muncie 4 speed (orginally an automatic car)
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