R45 Driveshells are compatible with R45, R45D 6 Bolt, and R45D Centerlock rear hubs with Twin Bearing systems. Driveshells are available bare without internals or complete, ready to be lubed and installed. Not compatible with Gen 4 equipped R45/R45D rear hubs. PHB845(B) - HG-EV Driveshell, 12 speed, Bare Empty driveshell that requires the transfer of the original bearing internals from the original driveshell PHB847(B) - HG-EV Driveshell, 12 speed, Complete