Replaced the upper dishwasher rack due to rusting.

To remove the upper rack, twist the support rail end caps toward the center of the machine and slightly downward. The caps will come off and you can slide the new rack into place. Reverse the process to replace the end caps. One of mine broke and I will need to order replacements.
The original rack is no longer available. The replacement, which is the only one GE offers, has less storage space and is not as sturdy. It bends downward when full. I am very disappointed and recommend not replacing the rack unless you have no other choice.