This Avian Backplate Motor Mount, 50-63mm is compatible with the Spektrum Avian 5605-450kv Brushless Motor (SPMXAM4770), Spektrum 6362-250kv Outrunner Brushless Motor (SPMXAM4795) and the Spektrum Avian 6362-200kv Outrunner Brushless Motor (SPMXAM4796).