ETP
Energy Transfer Products ETP 3/8 Locking Assembly Tool Interchange Adapter
You will find that the 2N, 8N, 9N 1939-1950 tractor is light enough to tow with a pickup truck.
5 Boxes Of 20 = 100 ETP 4100ST 1" Set Screw Type EMT Connector Insolated Throat
It measures 1 inch x 2 inches x 1 inch, so it works with other small parts.