Product review (5 stars): Glad I decided to replace all of them instead of ...
The lower rack on my dishwasher was non-fuctional with the original wheels falling off every time I attempted to roll it out.  This new stud design is significantly improved over the original.  The new wheels are a bit wider than the originals and the rack rolls much smoother and seems more sturdy/secure with the new wheels.  Glad I decided to replace all of them instead of a few at a time.  Huge improvement!!