George M
For the '09 you need the V2 ST Turbofin Kit ( its the threaded longer masts and turbo fins) For the "08 you need the ST Turbofin Kit with the set screw mast ( longer mast with set screw slot and turbo fins)
IMO, Adding the sailing rudder and V2 Turbo fins is best upgrade that can be done. I did it to my '08 Oasis and '09 Adventure.
I would recommend, however upgrading your '08 sprockets to V2 sprockets (about $15 each) and going w/the V2 ST Turbofin kit. Its an easy upgrade and well worth it, because the turbo fins will stay in place. The turbo fins on the set screw masts tend to loosen up and drop because of the added torque. That is why I upgraded my '08 drive to the V2's, never had a problem or worry since! When changing sprockets, re-lubricate everything it makes a big difference.
Bob
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