Spindle Assembly Includes pulley and nut, Grease fitting, OD of Pulley: 5 3/4 ", No threads in housing, use self-tapping screws, Specially designed: to replace 6 pt. star spindle shaft. Replaces Part Numbers: MTD 918-0574, Troy-Bilt 918-0574, MTD 618-0574, MTD 618-0565, MTD 918-0574C, Troy-Bilt 918-0574C, Troy-Bilt 618-0565, Troy-Bilt 618-0574 Stens Part Number: 285-105