What I'm really looking for is the dimensions of the outside edges (borders) and the distance between the two pads for doubles. DDrhomepad has a link to the melting pot for these full dimensions, and, well, that site is no longer.
Pump it up has different dimensions, the corner pads overlap the center pad by a bit (If it were a number pad, the "4" and "6" positions are smaller than the others). I may take a tape measure up to Dave and Busters to measure their PIU.