If you ordered the wrong size Irvine replacement springs for your RV roller shades, you can return the incorrect items using Elkhart RV Parts' return portal at https://elkhartrvparts.aftership.com/. Before ordering the correct parts, verify your shade model by checking for the 'ISD' marking on the end cap or a sticker on the shade bar to confirm it is an Irvine product. Elkhart RV Parts offers a variety of replacement springs in small (13.5"), medium (18.5"), and large (23") lengths designed for premium RV roller shades with slow rise features. For assistance selecting the correct size or other components like auto stops, you can contact Elkhart RV Parts customer service directly at [phone removed]. This ensures you get the precise parts compatible with your RV shades and avoid installation issues.