DESCRIPTION One New Replacement Seat Back Cushion (Black) Fits John Deere Tractor Models: 50, 60, 70, 80, 520, 530, 620, 630, 720, 730, 820 (2 Cylinder), 830 (2 Cylinder), A, B, D, G, R. — 6″ Height — Solid Brass Rivets — Black Vinyl Cushion — Steel Base/Base — Correct Curvature — Measurement Where Backrest Bolts to Frame: 16.50″ (Space Between Bolts) For Tractors Without Recess for Light Mounting (i.e. Light Mounts to Battery Compartment) Replaces Part Numbers: AB3624R, AR21965