a WAG on those rear tires would be $1200 to $1500. The fronts are multi-ply and would be $125 each. Then too......they will charge you for a tire truck to come to your place and mount them......and put any fluid in them, etc. Or......you gotta haul it.
It wouldn't surprise me if you dropped 2k to reboot that tractor....all said and done. But I am guessing. Ask a tire shop.
Welll shoot, I'd rather just drive the extra distance and get the 135 with the new stuff!