The Irvine 0.75" Auto Stops (SKU: MRL-A1800) you selected are the appropriate component family for your 0.75" diameter Irvine Valu-Line roller shade. However, the spring currently listed and titled as a replacement for RV shower doors is not confirmed compatible with your Valu-Line window roller shade. Due to differences in design and specifications, the shower-door spring should not be assumed to fit your roller shade assembly. We recommend not ordering the spring until you provide additional details such as product page links, photos of the shade and damaged parts, and any original part numbers or labels. This information will help confirm the exact spring model required for your 49" wide roller shade, ensuring you receive the correct replacement part. For now, you can confidently order the 0.75" Auto Stops, but please hold off on the spring until compatibility is verified.