Product review (5 stars): Now my dishwasher works better than new
Now my dishwasher works better than new.  They were a little tricky to figure out how to remove the old broken ones, but once the old ones were out of the way, the new ones went on easily! Go ahead and buy the upper rack stops because they are likely to break when you remove them to replace this part. I broke one - the other was reusable but I replaced it anyways because the old plastic was brittle.