Here I have two Goodyear Tractor Tires (14-26 6 Ply R-1). They look practically brand new. No punctures or tears. Tread and sidewalls are in perfect shape. We bought a farmstead and there were in one of the out buildings.
From what I can find on the internet they are slightly narrower than the more common 14.9-26 tires but they should work/mount on the same rims.