One New Aftermarket Replacement Round Headlight Socket that fits the following machines and models:Fits Ford Tractor: 2000 (3 Cylinder), 2000 (4 Cylinder), 2600V, 3600V, 4000 (3 Cylinder), 4000 (4 Cylinder), 4600SU, Golden Jubilee, Jubilee, NAA, NAB, 501, 541, 600, 611, 620, 621, 630, 631, 640, 641, 650, 651, 660, 661, 671, 681, 700, 701, 740, 741, 771, 800, 801, 811, 820, 821, 840, 841, 860, 861, 871, 881, 900, 901, 941, 950, 960, 961, 971, 981, 2030, 2031, 2100, 2110, 2111, 2120, 2130, 2131, 2150, 2300, 2310, 2600, 2610, 2810, 2910, 3000, 3055, 3100, 3110, 3120, 3150, 3190, 3300, 3600, 3610, 3900, 3910, 4030, 4031, 4040, 4100, 4110, 4121, 4130, 4131, 4140, 4200, 4410, 4600, 4610, 5110, 5200, 5600, 5700, 7100, 7200, 7600, 7700, 540A, 545A, 535, 540, 545.Fits Ford Industrial / Construction: 230A, 340A, 231, 233, 234, 333, 334, 335, 340, 420, 445, 445A, 450, 515, 530A, 531, 532, 535, 540, 545, 3400, 3500, 4400, 4500, 540A, 545A.Fits Massey Ferguson Industrial / Constru