For Price Quotation Purposes, you will want to use the largest dimension of your spa cover measurement for the Size option. For example, if your spa or cover is 48" x 89", you will want to click onto the "Up to 96"' option, as the length of your spa cover is 89" and most closely matches the selection of sizes available.
At this point, don't worry about the fit! We're just giving you the opportunity to get a price quote. We will be asking for more specific information regarding the size of your spa or spa cover under the Our Easy to Order System tab.