The owner's manual provides this information. Make sure you have the correct manual for the year and are looking at the right set of specifications (made that mistake once...). Also, when buying the rope, I would err on getting a couple of extra feet (made that mistake too).
I have a 1994 Hunter 26. The owner's manual includes the 19, 23.5, and 26. I attached a scan of the Rigging Specifications page for the 23.5 from my manual. The "CB Uphaul" is the line that attaches to the swing keel and comes up through the compression post. The "CB Cascade" is the line on the deck.
If you do not have the manual or need further information, contact Hunter. They are a great resource. It's amazing how much info they still have on these older boats. The number is (386) 462-3077. Ronnie Barnes in parts really helped me out.