I know someone will chime in that their 68 has the cutouts under the insert. I have yet been able to find a org unmolested car that could prove this, not saying it's not possible just hasn't been proven to me yet.
Here's a pic of a repo 69 hood with the cutouts.
Also 68 inserts will bolt into a 69 hood, but 69 inserts will NOT bolt into a 68 hood without some cutting to let the insert filler/screen screws to clear.