Abstract: A pickup truck bed liner is provided with an inwardly extending column-shaped projection adjacent the rear end of each side wall of the bed liner for close fitting engagement with vertically extending posts adjacent the end of each truck bed side wall. The upper edge of the bed liner is adapted to be fitted beneath the truck bed rail and an integral projection is formed on an upper edge portion of each side wall adjacent the column-shaped projection for engagement with a flange of each truck bed rail to secure the bed walls against movement relative to the truck bed side walls and support posts.

Abstract: A locking device is provided for securing a protective bedliner to the interior of a pick-up truck cargo bed wherein the cargo bed has side walls with inwardly extending horizontal flanges and vertically, downwardly extending flanges spaced from the side walls of the truck. The side walls of the bedliner are provided with a plurality of circular apertures overlapping the bottom edges of the vertical flanges and a locking device is associated with each aperture. Each locking device includes a base plate engageable with the wall of the bedliner around an aperture and a flat planar locking tongue extending perpendicular to the base plate through the aperture. The locking tongue includes a shank portion having first and second substantially parallel edges disposed substantially perpendicular to the base plate and a retainer portion extending laterally from the shank portion substantially parallel to the base plate.