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 significanty reduce bush deflection and ensure a much smoother operation throughout the range of suspension travel. In addition to the move to a spherical bearing, our setup is unique in that it provides the ability for caster adjustment /- 1° We have chosen to use a common (HCOM24T) spherical bearing which is PTFE lined and self lubricating for increased longevity. Simply press out the OEM bushing and press the replacement unit in it's place. Sold as a pair Vehicle Compatibility: - Nissan Z34 370z - Infiniti G37