Required to properly mount the tray assembly. Adjustable mounting position allows the tray to work at its maximum potential by being as close as possible to the rotating assembly (min .100 inch) and to avoid any unnecessary interference with the oil pan.Install with the 7/16 inch nuts torque to 65 feet per pound or 1/2 inch to 85 feet per pound using oil, and the 3/8 inch nuts torque to 35 feet per pound.