I did some measurements, measuring from the driverside drip rail 13 inches over and up 1/4" from the edge of the dash panel seam is the first hole, the others are all aprox 7 and 1/2" apart and all 1/4" up. spacing is within 1/4" on all of them. I am charging camera battery now and will add pics later
Jerry Tallman 69 455/4sp Windward Blue, deluxe parchment bench seat, under major restoration je_tallman@yahoo.com