Product review (5 stars): The Right Part Fast
Delivery was quick and excellent! Make sure you change both sides at the same time because both sides deteriorate.  The design flaw is having to keep the top rack in elavated position for room on the bottom rack causing more side to side movement in the top rack.  This places stress on both sides of the top rack part.  I'm surprised Whirlpool doesn't come up with an after market stainless steel bracket that extends to both wheels poking through the same spot with threaded ends.  Add  a screw on stainless axle to receive the wheels on both ends.  Pop on the wheels and the problem is fixed forever.  Get it together Whirlpool!