Pulley, Alternator (Single). PART NO: A-384645R1. Dim A (1)1.480" Dim B (2)4.220" Dim C (3).670". . MODELS: Case-IH TRACTOR: HYDRO 186 Case-IH TRACTOR: HYDRO 70 Case-IH TRACTOR: HYDRO 86 Case-IH TRACTOR: 1066 Case-IH TRACTOR: 1086 Case-IH TRACTOR: 1466 Case-IH TRACTOR: 1486 Case-IH TRACTOR: 1566 Case-IH TRACTOR: 1586 Case-IH TRACTOR: 3388 Case-IH TRACTOR: 3488 Case-IH TRACTOR: 3588 Case-IH TRACTOR: 3688 Case-IH TRACTOR: 3788 Case-IH TRACTOR: 4166 Case-IH TRACTOR: 4186 Case-IH TRACTOR: 6388 Case-IH TRACTOR: 6588 Case-IH TRACTOR: 666 Case-IH TRACTOR: 6788.