ID: 5/8" OD: 1/8" Width: 1-1/8" Flat OD: 5-1/2" Flat Deck Idler Pulley Compatible With John Deere AUC10172. Fits JD Z335E ZTrak (w/ 42"Accel Deck), Z525E ZTrak, Z535M ZTrak, Z535R ZTrak (w/ 54"HC Deck), Z540M ZTrak, Z540R ZTrak AUC10172, 15959 Deck Flat Idler Pulley Compatible with John Deere Z335E Z525 Z535M Z535R Z540 Z525E, Z540M, Z540R