A sliding door assembly comprising one or more glass doors. Roller units are secured to a top portion of each the glass doors. The roller unit have a roller portion projecting out of a plane of the glass door. End members adapted to be secured to a structure at opposite ends of two transoms. Each said end member has two receptacles for receiving opposed ends of the end members. The receptacles of each said end member being spaced apart to hold the at least two transoms in a spaced apart and generally parallel relation, such that a guideway is defined between the transoms for holding captive the roller portion of the at least one roller unit for movement of the at least one glass door in its plane.