Product review (1 stars): Thin cheap metal - Workaround Explained
The reason I had to replace the metal is that the original metal brackets bent out of shape after just a few months of dishwasher use.  I found that these did the same thing!

Workaround:
I couldn't find thicker metal options out there, so I ordered an additional set and doubled them up when installing them.  You have to use some needle-nose pliers to convince two brackets to lay on top of each other, but it's pretty easy since the metal is so thin.  I also raised the feet of the dishwasher so that the brackets were not "angling down" from the counter to the dishwasher.  This worked beautifully, I've had no problems with them bending out of shape since.