I have read that the only 40 inch tractor tires still being made are only 9.5 inches wide.  The Oliver 70 and 80 used (in some instances) 40 inch tires that were 11 to 12 inches wide.  I am in need of one of the old 40 inch tires that are 11-12 wide.  It would not have to be in great shape, just good enough to hold air.  Anyone know of a source?