Hi Lew!
I ordered a set of the replica bias ply, non-DOT Goodyear billboards for my ERA:
http://www.rogerkraustires.com/Cobra/
Mine are the ones in group "B" - haven't used them yet, car is not done
I see Roger carries 15" Avon, Hoosier, etc also. His stock tends to depend on Goodyear's irregular production schedule.
Good luck!
Sam