1974 power wagon question

I have been looking at snake river's 4x4 site and noticed this article on the 1974 dodge 4x4 power steering box on an M-37

http://www.snakeriver4x4.com/psteering.html

my next question is have any of you ever seen one of these brackets? most I have ever seen for the 1972-1980 dodge trucks mounts direct to the frame with no bracket. I'm thinking I want to do this swap so does anyone have any info on the bracket that mounts the box? suposibly its a factory dodge bracket