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I replaced the right side running board motor not too long ago. Bought on Amazon. Here is the part number for the driver's side. $86.98. Also, there is a small metal part on the bracket itself and if it out of place it will not let the running board retract. Quite tricky to do but with 2 people it can be done. Hope this helps.
9qautoparts 9L7Z16A507A Left Driver Side Running Board Motor Compatible for Lincoln Navigator Ford Expedition 2007-2014 FSM1P5 747-900
by 9qautoparts