Product review (5 stars): GE Dishwasher Rack Hardware: Perfect fit
I have a very old GE Dishwasher which just works fine but all the racks supporting hardware had worn out causing the racks to get stuck and drop when moving in and out.

So instead of replacing the dishwasher ($450-$600) for such a trivial problem I decided to fix it personally and found all the parts on Amazon. This is one of them and fits perfectly. The delivery was quick and was able to fix the dishwasher under 20 mins.