For a large RV roller shade measuring 92¾" wide with a spring length of 23½" and an end cap diameter of 1 1/8", the recommended replacement is a 1.25" roller tube spring designed for premium RV roller shades. This spring matches closely with your measurements, as the 1.25" system typically fits roller tubes with an outside diameter near 1.25", which is close to your end cap size. We suggest selecting the slow-rise 1.25" replacement spring, especially the option designed for shades wider than 40". To ensure proper fit, please measure the outside diameter of the aluminum roller tube itself, not just the end cap. If the tube diameter is exactly 1 1/8" and not 1.25", further assistance can be provided to find a suitable alternative. This spring is durable, compatible with large RV shades, and available for purchase online.