Husqvarna 175820 Flat Idler Pulley For Husqvarna/Poulan/Roper/Craftsman/Weed Eater
Husqvarna, Poulan, Poulan Pro, Roper, Sears/Craftsman, and Weed Eater 175820 Flat Idler Pulley.  Current part number 175820 replaces previous part numbers 539107620 and 11633.  Idler Pulley used on 48-inch decks.  4 1/2-inch OD, 3/8-inch mounting hole, 1 1/16-inch high.