Spindle Assembly OD of Pulley: 5 ", Includes pulley, nut and grease zerk, Specially designed: to replace 6 pt. star spindle shaft, No threads in housing, use self-tapping screws. Replaces Part Numbers: MTD 918-04129B, Cub Cadet 918-04129B, Cub Cadet 918-04129, Cub Cadet 618-04129A Stens Part Number: 285-842