I have a Merc 225 4 stroke sn 2b647142 model number 12250033A I'm wondering what lower unit I have, and what hub kits will fit it? I belive it has the Merc racing HD hub kit on it now. I ordered a tempest plus for high altitude my dealer is sending me. I belive the hub kit he is sending is not the same as the one that came from the factory with the 23 fury. Will my lower unit shaft accept more than one hub kit? Thanks!