I went to the gararge where I have all of my car work done and asked if they had a brake drum or rotor and one followed me home. (FREE!) I found the oversized washer at a Fastenal store, and the iron pipe at an ACE Hardware store. I found the blower at a dump if I remember correctly, and the piece of flexible metal hose I found at the stove manufacturer in my area.
The cost so far of the iron pipe and washer is $41.27. I know I still need bolts, washers, nuts, welding, (I can manage that)and some other bits that I may have to make up. I intend to cut the 2" x 24" pipe into two pieces to make a cleanout and blower intake from the one piece. I may not use the blower shown as I have others I have scrounged over the years, and one of those might be ready made for this project.
The small nipple (Short pipe piece) in the picture is 5" long, is there any rule of thumb about the length from the flange to the Tee in these forges? If not I'll just put the pieces together as I imagined them from the pictures I've seen of everyone elses forges.