QualityParts From Oregon That you can depend on. "V" belt idler pulley: For 50" cut on 20 and 22 HP front engine tractors; Outer diameter: 3-1/2", Width: 3/4", Bore: 3/8"; Replaces AYP 139245; ; ; Oregon Equipment Parts 34-049 Idler Pulley V Ayp[756]