550, 560, 570 Seat Cushion and Backrest for CockshuttOne New Aftermarket Replacement Seat Cushion and Backrest for Cockshutt Tractors This aftermarket replacement seat cushion and backrest set restores operator comfort on Cockshutt 550, 560, and 570 tractors. The set includes both the bottom seat cushion and the backrest cushion, designed to mount to the original seat frame. Cockshutt tractors of this era were built with close ties to the Minneapolis Moline platform, and this cushion set is also