You are referring to the spin basket. The spider arms (there are three of them) are welded to the back of the basket as supports. You cannot purchase them separately as they are part of the entire basket. The replacement part number for the model you have listed is W10250573. You can search the following websites:
searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com
Prices vary between these sites, so shop and compare. The first three sites on the list also include helpful exploded view prts illustrations to assist you in locating and properly identifying the parts you need.
This is not a cheap part and its a labor intensive undertaking. If you've never replaced a spin basket and need step-by-step instructions, the following link explains how:
http://www.fixya.com/support/r752855-replacing_rear_tub_bearing
Its a lengthy read, but its thorough.
If you have any questions please post back and let me know. I hope this helps you.
NOTE: Repairclinic.com had it listed for the best price at the time I posted this.
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