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My old ones were lubricated. The grease was packed in the white pinion assembly as shown in Jasper's attached image.
Ditto on David's advice to avoid dwelling at the stops and to avoid manually pulling on the headrests.
From what I know about gears, there is a spreading force any time they are used. This may be the force that breaks it. For preventive measure it may pay to wrap the pinion assembly tightly once it's mounted in the seat frame with something like plastic ties. This technique has also been reported to repair some broken headrest guides.
David, your assembly book calls it "adjusting rail" (PN 124 970 01 26). My replacement part from Fastlane calls it "headrest guide" (PN 124 970 02 26). I don't know why. (Picture is shown without pinion assembly.)
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95 E320 Cabriolet, 169K
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