Part Number 41420V - A New Original Left Threaded Piloted Stud Nut For Dual Wheels On IH Trucks.  This Left threaded stud nut is located in the MT126, MT143, MT144, MT145, MT146, PC-4000, PC-5000, PC-5870, PC-8000, PC-8300, PC-9300, PC-9600 Parts Catalog.  Out Thread size is 1.13"-16, Inner Thread size .75"-16, Inner Thread Depth is 1.25", Overall Length is 2.22".