A refrigerator appliance including a compartment within the refrigerator appliance, a liner defining a rear wall of the compartment, a first vertical support rail attached to the rear wall, a second vertical support rail attached to the rear wall wherein the second vertical support rail is offset in a generally horizontal direction from the first vertical support rail, and a cover. The cover is attachable to the liner and includes a vertical slot extending therethrough and configured to align with and allow access to one of the first vertical support rail and the second vertical support rail when the cover is attached to the liner, while a portion of the cover is positioned over and prevents access to the other of the first vertical support rail and the second vertical support rail.