Looking for some assistance. I have a Ferguson TO20 and recenlty placed new rears 11x2x28 American Farmer tires on it. Tires are not holding air because the rims are rusted. (knew the rims were bad but was hoping to get a little more life outta them ) Now I am in need of new rims but I having a difficult time finding what size rims are needed for this size of tire and model of this tractor. Can someone please suggest a rim size that will work? Your help is greatly appreciated.