Governor Spring Kit Fits Ford 851 861 501 901 700 650 4000 600 2000 601 NAA 701One New Aftermarket Replacement Governor Compensator Spring Kit that Fits Ford New Holland Tractor Models: 1801, 1811, 1821, 1841, 1871, 1881, 2000 (4 CYL 62 64), 4000 (4 CYL 62 64), 501, 541, 600, 601, 611, 620, 621, 630, 631, 640, 641, 650, 651, 660, 661, 671, 681, 700, 701, 740, 741, 771, 801, 811, 820, 821, 840, 841, 850, 860, 861, 871, 881, 901, 941, 950, 951, 960, 961, 971, 981, NAA Fits 1 4" by 28 pitch rods. Part Number: NCA99810A