Jeff's, NPD, and CJ Pony all sell the Precision Exhaust system. It is close but not a true repro. The Y-pipe is pretty close and the muffler is correct but the tailpipe is not correct. Shelton Manufacturing made a true repro but he sold the business a while back and the new owners no longer offer it. The precision kit is as close as one can get off the shelf now.
As far as the hangers, I found a Mustang part that was nearly identical to the rear mount but the forward mount(by the muffler) is Bronco specific. Shelton was reproducing those as well but like above the new owners don't.
I have a bunch of hangers I collected over the years and may have a set that you could clean up and replace the rubber on and be good to go.
Shoot me a PM if interested. I will have to dig them out and see what I have left.