Eibach 22mm Rear Anti-Roll-Kit | 1999-2004 Porsche 911 (7213.312)1999 2004 Porsche 911 Rear Anti Roll Kit (Rear Sway Bar Only) by Eibach Complete your suspension upgrade with an Eibach Anti Roll Kit. While our Pro Kit and Sportline spring sets are regarded as the primary suspension enhancement components, the Eibach Anti Roll Kit allows critical fine tuning of your cars handling characteristics. Eibach Anti Roll Kit reduce body roll through increased design stiffness over stock bars. The result: increased handling