Ball and joint. The thread and rod size may be required. A better DDC shop should know what your talking about. Hell, send them a picture with your serial number. A better DDC shop can look up your serial number, and tell you where that drain plug came from.
The Jawn...tell them you need the jawn that connects the stop jawn to the arm jawn on the speed jawn.... I'm not sure what it's called sorry. Hope you got it by now? or found it.