Rotunda essential special service tools. Socket, 9.75 Plenum 4 Pin. Application; electronic Limited slip differential (E-LSD) with heavy duty trailer tow (HDTT) package Vehicle: Explorer. This is from a closed Ford dealership. I do not know anything about these tools. What you see listed in the pictures is what is included. I’ve taken multiple pictures so the picture showing one bag of tools one round piece of steel and one piece of paper is what you will receive. Packaged double boxed and tight. Keywords rear axle nut socket, OTC, OEM Ford, special tool.