Hello - Thank you for leaving your review. We are sorry to hear of the trouble. We have two different thicknesses for our deep pleat filters, standard and slim fit. The standard size is approximately 4-3/4" thick and the slim fit is approximately 3-3/4" thick. We hope the seller is able to exchange this for you. If you have any trouble, please feel free to connect with us directly at 1-800-388-3458 Mon - Fri 8:00-4:30 CST. Please provide case Number 22946980 Thank you.