First, here's the link to the 2015 thread:
Here's some pictures of the early muffler end with the 3 rivet bracket
And here's the earlier cast iron, single bolt front end:
And the back end;
Note that the single bolt cast muffler still requires a front frame mount, as the muffler pipe just ends inside the front's "snout." the stamped unit saved manufacturing expenses by using scrap metal pieces and a stamping process instead of castings (and patterns, etc.), and one less bolt to supply and install. Henry's engineers were pretty clever!
Thanks for posting David. There are a lot of guys who probably haven't seen these kind of photos. I'm glad you did it and not me. I'm not that good a posting pictures.