Product review (3 stars): Assembling the first side is tricky and I recommend looking for a youtube video (search on the model ...
This is a substitution because apparently the original parts were not strong enough.  Mine broke off after less than two years of use (and we are only two in the household).  The replacement kit here is certainly stronger, however the new design essentially loses two places for glasses in the top shelf where the assembly attaches to the rack.  The old one was tight, but some smaller glasses would fit in the second-to-last position on the side areas.  Now nothing but small items can go there.
Assembling the first side is tricky and I recommend looking for a youtube video (search on the model number).  The second side goes fast once you get how it goes together, but the instructions are lacking, and the photos seem like they should be clear but they are at angles that make it difficult to get the orientation.
I am not sure if there is any other choice out there when you need a part like this, but it works.