I measured on a '70 Challenger with a factory vinyl top and got 12 holes - 2 on each roof pillar and 8 along the back filler (Dutchman) panel. I tried to take pictures, but they didn't make any sense, so here goes...
There is a little vertical sheet metal "wall" that separates the forward side of the trunk area from the quarter window area. The first hole is two inches from that wall; the second hole is 9" from that wall (7" from the first hole).
The rest of the holes are on the filler panel and all are 1.5 inches down from the window gutter. Measuring across from the side seam of the filler panel (and the quarter panel) they are 1.25, 9, 17.5, and 25 from each side. Good luck.
On our car, the trim strip is a little higher than the bottom of the drip molding