A mounting assembly for operatively mounting one or more glass shower door panels to one or more panels is described. The mounting assembly includes an elongate guide assembly adapted for receiving and retaining a carriage assembly for mounting a reciprocating glass shower door; and a mounting assembly including one or more end mounting devices for mounting one or more ends of the elongate guide assembly perpendicular to one or more glass panels or walls. Also described is a mounting assembly including an elongate guide assembly adapted for receiving and retaining a carriage assembly for mounting a reciprocating glass shower door; and one or more spaced guide mounting devices for connecting the guide assembly to an adjacent parallel panel and spacing the guide assembly a selected distance from and parallel to the adjacent parallel glass wall panel to provide access between the parallel glass wall panel and guide assembly for cleaning.