Yeah, I think they simply ran out of good descriptive names for each those 5 links. Also, I am fairly convinced that all of the wearing parts are not actually listed.
I would suggest sending an email to Phil, and requesting that he email you back a diagram picture of the rear suspension.
Did this a couple of weeks ago for some shifter parts, and it was most helpful to be 'on the same page'.
Best of luck. Let us know how it goes.
1986 300E 5-Speed 240k mi.