Product review (5 stars): The best part of my relatively new Kitchen Aid dishwasher is the Whirlpool W10712394 Adjuster KIT replacement
I still hate the Kitchen Aid dishwasher but at least the Whirlpool W10712394 Adjuster KIT rack rollers are of much better quality than the ones that came on the machine.  The dishwasher is only a year and a half old and I have already replaced twice the oem assembly that the upper rack uses to mate with the rails.  When I found this better quality, compatible upgrade I ordered it immediately and am confident it will outlast the dishwasher since the cheap plastic wheels and axles have been replaced with metal.  The kit is a perfect fit and easy to replace.  DO NOT waste money on the plastic version that looks like the original, they last about six months if you are very careful not to overload the top rack.