I think wheels off a wd or wd45 will fit.
they will be 28" wheels.
I never understood why AC put 26" tires on D14???
if you go with a different set of wheels then new tires will be required.
I guess as long as the tires are not any taller then it would not affect the power of the tractor.
speeds would be different
can your old wheels be welded up, this is done many times to save old wheels.