Think it's easier to get the entire assembly, including the motors, cables and gears. I always have a spare one laying around and that's how I fixed non working seats on a W124 and W126. This would be something you find at the JY or on ebay.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).