Abstract: A shelving unit has left- and right-hand side rails for engaging the inner surfaces of opposed sidewalls of a display system. A generally trapezoidal bridge member having its upper lateral edge as the major side, is defined by two outer, longitudinal edges which slope inwardly at a prescribed angle as each moves from the upper lateral edge. The sloping longitudinal edges are adapted for frictionally engaging each respective side rail such that pressure exerted by the bridge member is sufficient to hold each side-rail in place between the inner walls of a display system. Each side rail and the bridge member define an upper surface for supporting a display item.