One Brand New Replacement Set of 4 Aftermarket Seat Cushions. Fits John Deere Models: Fits JD Track Tractors: 350, 450, 350B, 450B. Fits JD Track Dozers: 350C, 450C. Technical Information: Seat cushion is 21″ wide and 16 1/4″ deep. The back is curved and is approximately 13″ high and has 4 bolts in the back. The armrest is approximately 14 1/8″ high, 4 bolts in the back with a cutout for the seat back. Back: 22″ wide (widest part in the back) Right Left Armrest: 6.25″ wide (at narrow end) Right Left Armrest: 8″ wide (at wide end)