I think you could also source B7100 4WD wheels/tires as these are a bit more plentiful than the B7300. Just be mindful that you get 6 lug wheels.
I have two tractors, both HST-D units and one is the 6-12 and 8-16 R-1 ag tire combo and the other is the 20x8-10 and 29x12.50-15 turf types. The...