steering hose length for center console

[bradwilcox50]

I'm planning on replacing the mechanical steering with hydraulic on my '81 center console V-20. Any idea what length hoses I'll need? I know I can pull out the existing steering cable and measure it, but I'm using the boat a lot and I want to limit my down time if I have to order the right hoses. Also, if anyone has any advise about installing the Sea Star 1.7 system, please give!
Thank you,
Brad