RV window blinds should ideally match the exact dimensions of each window to ensure proper fit and function. Blinds made to a uniform size when windows differ (such as 25x30 versus 24x33) may not fit correctly, potentially causing gaps or overlap. For custom RV shades, it is best to to each window's specific measurements. Once production of custom blinds has started, changes are typically not possible, but additional shades can be ordered to fit other window sizes as needed.