At 10 months post-purchase both of the brackets on the window-end of the front window extension arms broke, most likely due to heat during storage. I first tried to 3D print new ones but it became apparent after only a short time that the extrusion plastic also was going to fail in the heat.
We found a simple fix for the broken brackets. We purchased a piece of aluminum bar from the local hardware store, bent two pieces into a j-channel, and then used a cut-off nail as the pivot pin. Works like a charm and unlikely to fail in the future.
Now that we know it works I'll likely remove them, prime and paint with a good quality black enamel paint before re-installing.
Dimensions that we used: 60mm / 15mm / 20 mm
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2013 Toyota Highlander 3.5L V6