Dave, feel free to upload the pics i sent you if it helps this story along any.
i don't think the one you have is my old bike.
mine should be pretty easy to pic as one side panel had "DG" cut into it with a coping saw {took me ages} and i broke the rear brake pedal off in a crash at mcarther park and had to make up a bracket to mount it to the frame as it broke free from it's std mount on the case.
so there should be a small non-standard bracket welded to the frame around the rear brake pedal.
cool bikes