packrat, I have a B7100 that has the subframe installed on it. I'm in the process of rebuilding the blade itself as the former owners, a small city a few miles away, tried to move the courthouse with it. It badly bent on each end and the wear edge is worn off up to halfway of the bolt holes. with that much wear it was no wonder that both skid shoe mounts were broken off too. I'm gonna disassemble the parts and replace the blade itself with a 3pt grader blade blade I have. seems simpler than reinventing the wheel. Cut the old one off, weld the new one to the bracket assy and add shoes. should look better and will have a replaceable cutting edge again.
now as far as what you need, i could help with pic's or....