Weird cutting edge. Galion 118

I am trying to replace the cutting edge on my Galion 118 grader. As I measure the cutting edge I come up with 3.5 inches from the side to to center of the first hole, then 11 inches center-to-center on all of the other holes with the last hole being 3.5 inches from the far end. 12 foot moldboard with 2 cutting edges, each 6 feet long.

Does anybody have a part number or source for these? The OEM part number crosses to a standard 3 inch, 3 inch, 12 inch, 12 inch, 12 inch, 12 inch, 3 inch, 3 inch blade.

Weird cutting edge. Galion 118