So I had to replace the neutral safety switch on my '03 Ranger (4.0 4x4). The nut holding the shift lever to the transmission (with the switch in between) was so rusted on the shaft I had to use a nut breaker to get it off. Now I need to get a new nut but having some trouble finding what size I need. The old nut is pretty mangled. Can't seem to find reference to the size online. Best guess would be 5/8 fine thread. No one local had anything close

Any one happen to know what size it is?