DESCRIPTION One New Replacement Set of 4 John Deere Track Tractor Cushions for Models: 350-450-550, 350B, 350C, 450B, 450C, 550, 555. Technical Information: Seat cushion is 21″ wide x 16 1/4″ deep. Back is curved and is approximately 13″ high with 4 bolts in the back. Armrest is approximately 14 1/8″ high with 4 bolts in the back with a cutout for the seat back. Back: 22″ wide (widest part in the back) Armrests Right and Left: 6.25″ wide (at narrow end) Armrests Right and Left: 8″ wide (at wide end)