OEM Replacement Back Cushion designed specifically for Wise 8WD156-784 Swingback Seat Frame To replace seat backrest cushion on Wise 8WD156-784 Swingback 70 Quart Cooler Seat, simply un-screw and remove the original seat backrest cushion and re-mount the new backrest cushion into existing aluminum swingback bracket holes Engineered for Offshore use, features high compression contoured foam padding design with Marine Grade 28 oz. vinyl, withstands the effects of sun, heat, rain and soiling under normal marine environment conditions Marine Grade vinyl covering features embossed vinyl detail and heavy duty welting trim To insure proper fitment, please note the replacement seat backrest dimensions - Thickness: 3", Width: 32.25", Depth: 6"