8N404 Years:1948-64 Seat Spring ( Flip Type) Fits Ford Tractor: Jubilee, NAA, 2000 4 cylinder, 2031, 2110, 2111, 2120, 2131, 4000 4 cylinder, 4031, 4110, 4120, 4121, 4131, 4140, 501, 541, 600, 601, 611, 620, 621, 630, 631, 640, 641, 650, 651, 660, 661, 681, 700, 701, 740, 741, 771, 800, 801, 811, 820, 821, 840, 841, 850, 851, 860, 861, 871, 881, 8N, 900, 901, 941, 950, 951, 960, 961, 971, 981 (4 cylinder 1947 - 1964 with standard flip back seat, NOT Rest-O-Ride). Fits Ford Industrial: 1801, 1811, 1821, 1841, 1871, 1881, 2030, 2130, 4030 4 cylinder, 4040, 4130 4 cylinder (4 cylinder 1947 - 1964 with standard flip back seat, NOT Rest-O-Ride). Fits Fordson: Dexta (Some 4 cylinder 1947 - 1964 with standard flip back pan seat, NOT Rest-O-Ride ), Super Dexta (4 cylinder 1948-1964 with standard flip back pan seat, NOT Rest-O-Ride). Replaces Ford Part Numbers: 81854639, 8N404A, 957E404, NCA404B. Designed for the standard flip back seat. Does not fit the Rest-O-Ride Seat (that is the one with rubber torsion springs).