One New Replacement Thermostat 168 for Ford/New Holland Tractor Models: 2000, 2310, 2610, 3000, 3310, 3400, 3600, 3610, 4000, 4000Su (4140), 4100, 4110, 4200, 4410, 4600, 4610, 5000, 5110, 5200, 532, 5600, 5610, 5700, 6410, 6600, 6610, 6700, 6710, 6810, 700 Series, 7000, 7200, 7410, 7610, 7700, 7710, Series 800, 8000, 8700, 900, 9000, 9700 Series Fits Ford Industrial/Construction Models: 3550, 420, 4400, 445, 4500, 515, 535, 540, 545, 550, 555, 7500 Technical Information: New thermostat with opening temperature of 168 Fahrenheit / 74 Celsius. Replaces part(s): D8Nn8575Aa