Thanks for all the responses and help. Now for an update to all who responded regarding a new boot for the Warm Morning...and to coal berner who wrote: "Call this place for a boot they have a lot of older stove pipes and boots that might fit yours. Is the oval Pipe flue 7 or 7.5?"
Well, the boot is 8.5" wide by 4.5" high and reduces to a 6" circumfrance. I found several internet listings for oval boots but none of them seemed designed to fit those dimensions, although they may do just that.
But because I'm low on $$$$, I got to thinking, "dangit, Tamecrow is right, just fabricate a new one." I remember when our Seabee battalion was stationed in Antarctica back in '72 we fabricated a lot of stuff for an incinerator we built at McMurdo Sound. So on Sunday I made a template out of that old, rusted-out oval boot and fabricated a new one from some galvanized sheetmetal. Problem solved for the time being but I would really like to have it made from stainless.
Next on the fabrication list is a pre-warmer for the H2O heater.
Now, today (Monday) I asked the wife to drive her 'girlie' truck up to Thorn Hill and get us a load of coal. She came back with a real good load of mighty BIG LUMPS out of a mine in Harlan, KY (see photo). $85 bucks a ton. Whoa, I'm telling you the truth, those suckers are burning like logs, real nice even burn, very little smoke and NO sulfur smell. This is some good fuel for a starving hand-fired coal stove. I will search around for the specs on this coal and post them here.