CNC Dude: The studs are 3/8' and from the front going to the back the spacing is-2 1/2"-3 1/2"-2 1/4"- 5 1/4- 2 1/2"- 2 1/2"- 5 1/4" - 2 1/4"- 3 1/5"- 2 1/2". This is close as I'm working with a machinist ruler. Are we anywhere close?? Norm