Likewise, the rear end 44 may optionally be provided with a lip (not shown) similar to that of lip 52, also for securing additional components to the base member 32 and/or for securing the rear end 44 between the well grid floor 20 and the well display unit.Turning again to FIG. 6, in addition to FIGS. 1 and 2, the bottom 40 of the base member 32 is configured to support articles such as boxes, co