Product review (5 stars): Real factory part, mine came with the gasket
Needed one of these when the spider arms on the stainless washer tub broke.  The washer tub was a lifetime warranty free part from Whirlpool.  This was the best price I could find from anyone reputable.  If you can do a basic tune up on a car, you can do this repair.  Look for videos on how to change the bearings on a Duet and you will see how this part fits in.