I have mine located approx. 9" in from each edge of the fender on the radiator support bracket. you could go less so it would be closer to the edges, if you preferred. I have a lift off hood, but used the same pins when I had a glass hinged hood.
they crack in the area of the weld, a common thing, even in no rust areas. the metal in that area is thin, a manufacture flaw..........bad repair job though...I have seen a repair kit for it somewhere, good luck