Lozier Flex Rx Back Retainer Flex Rx Back Retainers hold optional back panels in place between the Flex Rx uprights.Six required per back panelClear plastic ProductPriceQuantity Back Retainer,Clear (TA8231.XC4) $1.45 Your Cart Related Products Lozier Flex Rx Back Panel Assembly Lozier Flex Rx Island Section Lozier Flex Rx Wall Section