Generally there shouldn't be any lubricant needed on the headrest rails. The couple of plastic parts tend to break, if yours are all intact you can leave them alone.
Of more concern are all the cream-colored plastic trims at the sides of the seat hinges; some are NLA and the retaining clips tend to snap during removal. When re-installing, go nuts with the 10-15mm factory felt strips anywhere the plastic pieces touch metal or leather, to help prevent squeaks. Easy to do with the seats apart out of the car. The 70mm stuff is used under the spare tire, in case you were wondering.
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Hah thanks --- Wouldn't you know --- I used that same exact diagram to order all 4 felt sizes on Thursday!