A display bar assembly for mounting on spaced apart slotted uprights on a merchandising gondola or the like. A tubular display bar of polygonal cross section is fitted with a pair of mounting brackets, which are slidable along the bar to enable spacing of the mounting brackets to agree with the spacing between the slotted uprights, which can be somewhat variable. The mounting brackets are formed with openings which closely and non-rotatably receive the display bar and are provided with hook-like tabs which engage slots in the uprights. Flanged end plugs are received tightly in each end of the display bar to prevent removal of the slidable brackets, such that the display bar and bracket form a permanent assembly. The mounting brackets may have multiple hook-like tabs for installation on uprights of different thicknesses.