Product review (5 stars): This wheel assembly also fits some Sears Kenmore dishwashers.
I had a bottom rack wheel assembly break on my Sears Kenmore dishwasher.  I looked up the part number on the Sears website.  It turned out to be fairly expensive when I included shipping, so I searched the same part number (8268645) on Amazon.  The result came back as a Whirlpool wheel.  The product image appeared to be the same as the Sears wheel assembly and it was significantly lower in cost (with free shipping) so I ordered it from Amazon.  It is an exact replacement for the Sears wheel assembly.  Whirlpool must make some of the Kenmore models.