Need measurements for 70 dart Hood pins install

Sublime Swinger said
The hole should already be in your fender as seen in the pic. As far as hood hole it is easier to line up and mark the hole from the underside when the grille is off and the hood is down.

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mine is filled they never punched it out,I will drill it how can i get underneatrh to thread the nut on the Pin do i have to take the headlight assembly off?