OK, I was wrong. Tires are 212/80 D15 Front and 355/80 D20 Rear.
As far as I know Bridgestone ( Firestone Ag Tires ) is the only company that
builds a 355/80D20, and that Pillow Dia is a tube type tire. You can save a
bundle of money by buying the Carlisle 41x1400-20 Multi Trac C/S which is the
same or within tolerance rolling circumference. The bonus going to the Carlisle
is that the tire is tubeless and 6 ply rather than 4 ply too and.If you shop around you'll find that the Carlisle will be less than half price ;-) Over $300.00 ea less!!
The 212/80D15 might be discontinued from the Bridgestone line and don't recall off the top of my head what to do to replace the size conversion wise that's the same rolling circumference.There's some inventory still available though so shop for that too or send me an email and I can help you locate them.
cwtireal@gmail.com
Al