Husqvarna 532173438 Flat Idler Pulley Replaces: 173438, 131494, 104360X, 532 17 34-38, 532 13 14-94, AM37321, AM103480 This idler pulley 532173438 applies tension to the blade belt to spin the cutting blades Fits: 917279001; Genuine OEM AYP Part 3/8" bolt hole, 3-7/8" dia., 1-1/4" tall American Yard Products manufactures parts and equipment for leading brands in the industry. Those include Craftsman, Husqvarna, Poulan Pro, Poulan, Weed eater, Roper, Sears, Rally, EHP (Electrolux Home Products) and Yard Products