Product review (5 stars): This is the part you are looking for..
This is the best option for anyone looking to replace the flawed parts (in my dishwasher listed as parts W10350375 or W10350376) on the upper rack of Whirlpool manufactured dishwashers (includes Kitchenaid, Maytag, and some Kennmore brands I think).  This part is stainless steel with heavy nylon locks holding the wheels in place, it shouldn't break like the inferior parts that come with the dishwasher.  There is a great video on youtube showing in detail how to remove the old part and install the new one.  It took me maybe half an hour.  My kit came with a Philips to torx adapter, although I had the correct bit in my toolbox and that was easier to use.  Overall the part works well and should hold up much longer than the poorly made original design.