Crazy stuff. Knock on wood, I have had good luck with A Arms. I have bent the A Frame that the arms mount to but never an arm. Been on a viper since 14 and swtiched to a winder last season. Good luck with both except for the frame which I mentioned which was on the viper. Hit a rock pretty hard sidehilling.
You could look into options like Zbroz, alternative impact or Skinz maybe. Not sure who else makes them.
Its funny you mention the polaris. I have witnessed 3 bent or broken arms on the axys while in the back country. Same thing, bent while sidehilling, stump or tree jumping in the way.