OEM Part Number: 747-900 ; Fo-rd 9L7Z16A507A ; FSM1P5 Fits for: 2007-2014 Fo-rd Expedition; 2007-2014 Lincoln Navigator. 119.0 Inch Wheelbase. For exact compatibility please see Product Description. Running boards are located at the bottom of vehicles (on either or both sides) typically at the foot of a truck’s door. They serve two main functions. The most obvious function is to serve as a step. This is especially important for taller trucks (or if truck passengers are on the shorter side). Without an extra step into some of the taller models, getting into a truck will feel like climbing a mountain. Protecting vehicles from various forms of road debris is a second function of running boards. When vehicles move their wheels kick up all kinds of debris. Having a running board in place can block some of this debris from being thrown high enough to scratch or damage doors and side panels. This is a completet assembly coming with Bracket & Hinge. Professional installation is highly recommended.