IMO ditch the stacks, get a used OEM manifold and any decent muffler shop should be able to fab a Ford 8n or 9n style aftermarket muffler to fit, if your snow cab allows put it back in the horizontal position, is the muffler support still on the engine? If not bet one of our site sponsors may have one. Is this something you can make yourself? If the stack is only option or preference I'd still put a manifold on it and only stack once.
I have used stacks, can fab you a muffler, I make the flanges that weld to the muffler elbow and allows the bolting up to exhaust manifold ( may be a sticking point at muffler shop) if you need one, have several pre-made waiting.Also have NOS
OEM and several OEM used mufflers if you want to go factory, yes the NOS
ones are pricey.PM me if you want and maybe I can shed some more light on particulars.
My iPhone allows me to edit my pic and check the rotation of pic, I do this if I notice upon compiling post and attaching pics they rotate once copied, I then go back to pic hit edit and the rotation option, a 360 compass encircles pic and usually shows it's off kilter, hit reset it will realign pic and it's okay, if not I manually rotate it once ,apply ,then edit again and rotate all the way back to level then hit apply again, I don't know why ,it's a PITA for sure, but it then will allow correct orientation of pic once downloaded for copying to post