19-inch Twill U-shaped Chair Cushion (Set of 1, 2, or 4) - 19 x 19 - On Sale - Bed Bath & Beyond - 7673289
Cubilan 18.9 in. x 18.9 in. U-Shape Cushions Outdoor Indoor Tufted Seat Cushions for Wicker Chair Seat, Patio Cushions Pack of 2 B0BYMYSM81 - The Home Depot
1101Design Charcoal Tufted Chair Cushion Round U-Shaped Back 16 x 16 x 3 HDS568621SC - The Home Depot