Dethmers Manufacturing Company Demco Hijacker Ums Series Under Bed Mounting Bracket Kit Ford F 150 '04 '13. The UMS Series uses no visible bed rails. This series of hitches mounts to brackets underneath the truck box requiring only four holes for the mounting pins to attach the hitch securely to the brackets underneath. Fits 2004-2013 F150 6.5' and 8' boxes not for 5.5' box installs. Features of Dethmers Manufacturing Company 8551001 Demco Hijacker Ums Series Under Bed Mounting Bracket Kit Ford F 150 '04 '13 UMS Series uses no visible bed rails Mounts to brackets underneath the truck box Requires only four holes for the mounting pins to attach the hitch securely to the brackets underneath Fits 2004-2013 F150 6.5' and 8' boxes Not for 5.5' box installs Package Contents: Dethmers Manufacturing Company 8551001 Demco Hijacker Ums Series Under Bed Mounting Bracket Kit Ford F 150 '04 '13 Dethmers Manufacturing Company 8551001: Demco Hijacker Ums Series Under Bed Mounting Bracket Kit Ford F 150 '04 '13