Make em out of metal, then they never break! I did.
Like many of you I had both my original latches replaced under warranty despite the fact that I rarely opened those windows, becase the cheap plastic link cracked, and the replacement links started cracking in the same place a year later.
I am very disappointed to learn that they haven't improved the parts, and that they only sell them as part of a very expensive latch assemble. Shame on Toyota.
Not about to spend the money for new ones, I got some small pieces of aluminum and made a pair of replacement ones that should never break. I used the broken ones as a guide and used a die grinder with a carbide bit to do the final shaping. They look and work just like the original ones, and only look different becase I left them bright aluminum instead of painting them black.
Final cost to me, about 1/2 hour of my time, and $0.50 cents worth of aluminum.