FORD OEM 13-18 Explorer Front Seat Belt-Buckle Tensioner Left FB5Z78610E45A. See our other listings. Parts are shown individually with their own Ref #, while sub-assemblies may show multiple parts within a square or circle in the diagram with its own corresponding Ref #. Note: Sometimes the same Reference number can appear multiple times on one diagram. Typically only ONE part from ONE of the callouts will be included. Big 3 OEM Auto Parts LLC began more than 10 years ago with the mission to offer customers a convenient, professional, cost saving alternative for purchasing OEM Auto Parts.