GKTech - Z34 370Z/G37 FRONT LOWER ARM REAR SPHERICAL BUSHING UPGRADE (PAIR)The GKTECH 370z G37 front lower arm rear spherical bushing replacements are designed to replace the factory OEM rubber bushing. OEM rubber bushings are designed to absorb road noise but that comes at the cost of performance. It's common for upgrades to be made of a harder rubber or a polyurethane but rather than a polyurethane or rubber bushing we have chosen to use a spherical bearing to significantly reduce bush deflection and ensure a much smoother