The spindle assemblies are vital components of the lawn mower's cutting deck which enables the blades to work smoothly for an even cut. If your mower blades produce weird grinding noises, have a hard time spinning or spin unevenly then you may have a problem with your spindle assembly. This spinde assembly with pulley includes the mounting bolts necessary for a proper replacement. Compatible with the following: CC30 RZT-42 RZT-L42 RZT-S42 Craftsman R1000 Craftsman Z6000 Columbia ZT-S42 KH TB30 TB30R Mustang XP Zero Turn Bronco Replaces part numbers: 918-04822B, 618-04822, 618-04822A, 618-04822B, 918-04889, 918-04889A, 618-04889, 618-04889A, 618-04950, 918-04822, 918-04822A, 918-04950, 91804822B, 61804822, 61804822A, 61804822B, 91804889, 91804889A, 61804889, 61804889A, 61804950, 91804822, 91804822A, 91804950 This is a compatible replacement part manufactured by AA Ignition. This spindle assembly kit is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this spindle assembly kit fits.