Replacement Spindle Kit – is a vital component 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. Compatible Replacement for 42″, 48″, 54″ Deck Lawn Mowers and 100 Series Riders from 2006 – LA100, LA110, LA115, LA120, LA130, LA140, LA165, X105, X106, X110, X115R, X120, X126, X130R, X135R, X140, X146R, X155R, X165, X166, X166R, D100-D160, 102, 115, 125, 135, 145, 155CI |. Most spindles rotate for 1.8 million times approximately in about 8 hours of cutting. Replaces Part# Ariens: GY20454, GY20867, GY20962, GY21098, 285-851 commonly found on popular riding mowers with 42 inch, 48 inch and 54 inch Mower Deck. This spindle has a blade thread end of 5/8-18 and has a 7 point star shaped blade mount. The kit includes 4 mounting bolts, pulley lock nut and grease zerk for a proper replacement and superior performance. OEM Fit, Quality, Finish – While this is not a genuine OEM part, it is a direct replacement and will fit, look and function like the factory spindle if not better. Save money off of dealer prices by purchasing this part and installing it yourself. Lifetime Warranty – This spindle assembly manufactured by AA Ignition comes complete with a lifetime warranty. If the part ever fail simply contact us for a replacement. Save time and money by purchasing this part and taking advantage of our lifetime warranty.