The Lippert retractable shower door measures 72 inches in height, which is 4.8 inches shorter than your glass wall's height of 76.8 inches. Additionally, the door's width is 24 inches, significantly narrower than the glass wall's 38.6 to 39.4 inches. Because the retractable door does not come with an extendable frame, it cannot be directly attached to the taller glass wall without leaving a gap. This height mismatch may cause sealing and aesthetic issues. You might consider installing the retractable door on a different wall or side of the shower enclosure where dimensions are compatible. Alternatively, a taller shower door or a custom-built frame to bridge the height difference could be solutions, though these would require additional materials and effort. Since you are combining parts from different suppliers, we cannot guarantee compatibility or fitment. Careful measurement and planning are essential before proceeding with installation.