Spindle Assembly No threads in housing, use self-tapping screws, Specially designed: to replace 6 pt. star spindle shaft, OD of Pulley: 5 1/2 ", Height: 6 ". Replaces Part Numbers: MTD 618-04474, MTD 918-04474, MTD 918-04474A, MTD 918-04495, MTD 918-04495A, MTD 618-04474A, MTD 618-04495A, MTD 618-04495 Stens Part Number: 285-889