Dan,
I have a Radiola 100A speaker in good condition, metal box painted silver with nice cloth. I won it at an auction along with an Atwater Kent model 30 that really needs an AK E2 speaker. If you know where I could get a E2, PM me and I will sell it to you.
I am also looking for plain old paper speaker cones and coming up with nothing useful. There are some very good threads about using common materials to rebuild these old speakers. This one covers it well....
http://www.radiomuseum.org/forum/gru...rtschrank.html
Dave