Oregon 34-046 Flat Idler Pulley Lawn Mower Idlers For drive belt and mower deck on many 12-22 HP front engine tractors Replaces AYP 173438, 104360X, 131494 Overall width: 1-3/32", bore: 3/8" Outer-diameter: 3-7/8", flat-outer-diameter: 3-1/16", flat-width: 3/4"