Mine measured 1" from the edge of the ash tray opening, towards the driver, and 2" up from the bottom of the dash skin. The bottom edge has some tabs and such, like right at the ash tray. The 2" is measured up from the edge where there is no tab.
The hole was 3/4" in diameter, and had a 1/8" hole about 1/2" from center to center directly below the larger hole. There is a tab that fits into the smaller hole.
My dash looks like it's pretty thick there, like maybe there was a back up plate to the hole? Don't know, just a thought.