Original Craftsman, Poulan, Husqvarna Flat Idler Pulley Part Number 173438, 131494. This part is compatible with models including; 917255575,917276030,917275180,917992960,917270723,917270720,917270722,917270721,917255581,917255580,917259940,917256430,917255582,917276022,917276021,917276020,LOGTH2548A,917259920,96012006200,917270712,917288032,917288033,917288030,917991650,917288031,917270711,917270710,917255570,917259930,917278230,917255574,917256421,917255573,917256420,917255572,917255571,917276013,917276052,917276051,917276050,917270742,917272920,917270741,917272922,917270743 This is a manufacturer substitution. Part may differ in appearance but is a functional equivalent to prior parts including; 5321734-38,5321043-60,5321314-94,5321551-91,173438,131494,104360X,131494,104360X,155191,532131494 Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Husqvarna This blade idler pulley (part number 532173438) is for lawn tractors Disconnect the spark plug wire before installing this part