SPL Parts Porsche 996/997/986/987 Adjustable Caster/Trailing ArmsSPL Caster Thrust Tension rods provide a wide range of front or rear caster adjustment, allowing precise alignment for optimal turn in response and to compensate for variances between left and right caster. Any changes to camber will change caster necessitating adjustable arms for a proper alignment. Low friction, smooth articulating FK Spherical Bearings eliminate the stock mushy rubber bushing to provide a more responsive steering feel. Anti dive