A system for securing a horizontal display component on different brands of slotted vertical rails, where the different brands of slotted vertical rails have different distances between the vertical rails, and different distances between slots. The system includes a pair of brackets, which slidably adjust their horizontal positions on the horizontal display component. Each of the brackets include a bracket front, secured to a bracket back, at a spacing which slidably encloses a horizontal member of the horizontal display component. A first hook is affixed to the bracket. A vertically slidable lower is slidable on the bracket. The vertically slidable lower has a second hook. The second hook has a slidably variable distance from said first hook, so that the first and second hooks may engage different pairs of said slots at their different distances.