I actually talked to dad about this before since that's what he does. He's tool and die. He guessed a die like this would probably over seventy thousand dollars to produce. That doesn't include the costs to design it. It would have to be a multi-stamp with the machinery his company uses. They use single stroke machines so the lip for mounting would have to be bent in another machine. It would probably be cheaper for DMCH to have them built by hand for every D that needs one instead of investing in a die that would probably never return the profits.