MTD Rotary 3 Replacement Spindle Assemblies for Cub Cadet 918-0660, 618-0660, 918-0660B, 618-0660B. 3 Complete spindle assembly. Includes housing, shaft, bearings, and pulley. Pulley is 5 1/2" Diameter Has grease zerk. Has 3 point star shaft to fit MTD 6 point star blades