A few things to add and mix up.
That packaging may be wrong in the above pic. Those clips are 3/4 inch wide not 1/4. Unless they are referring to the height. But I was positive that those are 40 pound clips, not 20.
So I went to Amazon and the plastic clips I saw were all small and called 1/4 inch and 20 pounds.
I did not spend much time looking because I saw some potentially better options for my 2 cages on order. There were various METAL fixtures that looked good. The ones I liked best are called Z clips.
Now we can’t post advertising, so I will just post a pic.
I love having the strength of just one full rail, and metal at that.
They come 2 pieces per unit, so you will need 2 units- one piece for the back, and 1 piece for each side, thus 3 pieces per hide.