Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Might be smart to get a hold of Bob Vidan who posts on the PY forum. Bob has a lot of experience with early options. The original GTO Restoration Guide may have a dimension for the hole, otherwise a '67 Fisher Body manual will. I have later Fisher body manuals but gave both of my copies of the GTO Restoration book away, as they are of next to no help for '70-72 restorers.
Will note, national venders over the last 3 decades have cut down '68-69 power antennas and soldered the correct upper end back on. I believe they had to make the correct lower mtg bracket. In the late 80's, knew of several Pontiac venders that were making early correct GTO power antennas this way.