GM Genuine Parts Torsion Bar Adjusting Arms are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These torsion bar adjusting arms are connected to your vehicle's torsion bars and frame. They work in conjunction with the torsion bar, helping it to support your vehicle's weight and absorb bumps in the road. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).