They will not twist, bend, or flex like other arms. The only way you can ruin these arms is in a crash, otherwise, just keep running them year after year. It starts with the material; we use a stronger, more expensive aluminum. Next is the unique double bend design. This lets the arm pull straight on the birdcage, which doesn’t twist the arm, and pulls straighter on the torsion bar also. The arms are machined out of a big plate, which adds a lot of cost, but is a lot stronger than just bending a straight arm. We have the arms in stock to fit a 30” and 31” right rear torsion bar and standard left rear torsion bar. They come complete with a titanium pinch bolt.