RZT-S54 Spindle Assembly for 54" Deck - 618-06978 / 918-06978 - Fits MTD, Cub Cadet & Troy Bilt XT1-ST54 XT1-GT54 ZT1-54 ST54 ZT2-54 TB2454 T8400 G8400 Z6660 (3 Pack)

Set of three RZT-S54 replacement spindle assemblies designed for 54" mower decks. These spindles carry OEM numbers 618-06978 and 918-06978 and are compatible with MTD, Cub Cadet and Troy Bilt models including XT1-ST54, XT1-GT54, ZT1-54, ST54, ZT2-54, TB2454, T8400, G8400 and Z6660. Each unit has a height of 6 13/16" and a pulley outside diameter (OD) of 5 7/16", matching original equipment dimensions for a direct swap. Supplied as a 3 pack to make deck servicing and spindle replacement quick and convenient, built for dependable, long-lasting operation.