DOP753-08171MTD MTD Idler Pulley Kit No. 753-08171. This is a OEM part and it includes a spacer washer and a bushing. Inside Diameter 3/8, Outside diameter 4 7/8, width is 1" Replaces part number 753-08171, 756-04129, 753-08068, 756-04129B, 753-04129C and toro # 112-0314.