Genuine GM Holden Balancer for the 3.6L V6's, please note this has a KEYWAY slot for the crank, will not suit V6's without a keyway. Please be aware of this prior to install.For any Holden V6 tuning, supercharging, turbocharging, spare parts, performance parts etc. please let us know! Revhigh specialises in these motors and would be more than happy to assist.