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From your pic's it looks like you have the SeaStar system, click on the link below and scroll down to the second section, SeaStar install. instructions. You can check the number on the hydraulic cylinder in your boat and select the corresponding PDF manual for your app. These should give you a good idea of exactly what you need:

http://ww2.seastarsteering.com/SHARED....htm&1

Good luck and keep us posted on your progress!