published 2013
1) Get a length of straight stiff wire, (paint can handle works great).
2) Make a mark at 3 inches and 4 and a quarter inches.
3) Make a 90 degree bend at the 3 inch mark.
4) Put the wire in the passenger side tag screw hole.
5) Line the 4 inch mark up with the rear body panel.
6) Turn the wire so the angled part goes up and to the driver side, it will come to rest on the trunk latch (inside the trunk, it will be parallel to the ground).
7) Turn the wire towards the driver side which will then be pushing down on the latch, and it will pop the trunk.
Pushing down on the trunk lid helps.
I just went and did this on the 67 to make sure it would work, these are exact measurements. (Mark - Datsun 1500)