To measure your RV day/night pleated blinds for replacement, measure the width of the existing shade from edge to edge, which in your case is 36 3/4 inches. For the length, measure from the top of the shade to the point where you want it to stop, which you noted as 35 inches. This method aligns with the measuring diagram on our website. Since matching fabric color is important, we recommend ordering fabric samples from our store to compare directly with your current blinds. If the samples don’t provide a close match, we offer a custom replacement service where you can send your existing shade to us for an exact color match. This ensures your new blind will blend seamlessly with your others. We're here to assist you through the selection and ordering process to make sure you get the best fit your RV blinds.