Part number 684739C1 thermostat fits many Case-IH tractors and combine models. Combines are 1440, 1460, 1470, 1480, 1640 ( W/ D466), 1660( W/ DT446C), 1670 (W/DTI466C), 1680 (W/ DTI446C), 815(W/ D414), 915(W/ DT414). Cotton Pickers 1822 and 1844. Tractors HYDRO 100, 1066, 1086, 1466, 1486, 1566, 1586, 3388, 3488, 3588, 3688, 3788, 4166, 4186, 4366, 4386, 5088, 5288, 5488, 6388, 6588, 666 (W D312 Eng.), 6788, 686 (W D312 Eng.), 766, 886, 966, 986.