Our custom pleated RV window shades are designed to fit a wide range of RV models, including your 2005 Fleetwood Southwind. The thickness of our pleated shades when fully retracted is approximately 1" to 1.25", closely matching your original shades and should fit within your existing valence box. To ensure the best fit, we recommend measuring the inside dimensions of your valence box (width, height, and depth). We can custom build shades in your specified window sizes, including day/night options. You can order fabric samples to select your preferred color before finalizing your order. Use our Custom Shade Builder Tool on our website or contact us directly to start your custom order and get pricing details.