Are you asking about the "T" pins used to mount the clips for the windshield garnish mouldings?
I have information for a '64 LeMans in a Fisher Body manual, but it doesn't show those specifically.
Several references for 1966-67 A-bodies indicate the center of the stud 5/16" from the outer edge of the panel lip, if that helps.
This might also provide some info:
https://www.beldenspeed.com/technica...ation-diagrams