RSS Part # 3-256 Inner Spherical Bearing (Mono-ball) End Kit: Set of 2. Fits 991 GT3 OE Front Control Arms, 981 GT4 Front, and Rear Control Arms, Fits 986, 987, 996, and 997 with GT3/RS OE Front or Rear Split Control Arms, Fits any RSS Tarmac Series Lower Control Arm or replaces any OE Porsche Split Arm Inner Bushing. Provides a Bolt On Mono-Ball Performance Solution replacing rubber-mounted OE inner mono-balls. RSS Longer studs allow for more negative camber adjustment/gain vs. OE inner bushing. For camber shim kits see RSS Part # 308.