why in the world would you want to do that? they've recalled all the ZFT5P towers and will convert them to hydraulic for you. the ZFT5P is quite a bit more expensive than the ZFT4... IMO they look a lot better too.
Snork - that would not be advisable.. they had to stiffen the hull quite a bit in the mounting areas to accommodate the two point towers... i would be worried what that would do to my boat (i happen to have an 07 star too)
and you dont like you ZFT3? i loooovvvveeee my tower. Still think its the best looking tower out there. (unless you count travis moye's '11 anodized green ZFT5P)