If you know where to find the "other site" , they have a complete manual for the Dearborn Dozer/Snow Blade that you can copy.
On the same site, in the "How To's" Section, someone has posted closeup pics and diagrams with dimensions for making your own rear brackets for the Dearborn.
There are some real handy guys on both sites that may be able to fab some of the brackets for you. If you start a new post on both sites, just ask if someone would be able/willing to build them, or try it yourself.
I had a complete all original Dearborn Snow Plow that I just sold this summer after upgrading my 860 to do snow plowing. Over the years, I acquired some NOS pieces for it, cables, pulleys, etc. Hard to find as a lot of times the brackets end up being sold with the tractor instead of being taken off with the implement.
Note: Although there were some original frames built for the Jube and 100 Series Tractors, most of the frames were built for the N Series Tractors.....the Jubes and 100 Series are about 4" longer than the N's, so if your plow is too "short", you can just cut the frame, slip in another shorter piece of pipe and weld up so it works on your Jube.
Good Luck.....those plows can move a lot of snow with the right weight systems.