I have a fully operational 1986 Kubota B7200 HST with 60 deck and 4ft front loader. My problem is that my rear rims rotted to the point they crumbled to the ground. They are no longer available. I have 31x13.5x15 turf tires. Getting the tires is not a problem. I am desperate to get rims. Any suggestions? I have called every junk yard and Kubota dealer within 500 miles of me. I would also settle for a different tread. I just want my tractor up and running again.