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If you want to see for your self use a fish tape / or a wire or string. run it where you want it to go then measure it then you will be sure to get the right one. I used a fish tape when I was figuring out the length for my hydraulic system.
Guts

link for fish tape if you don't know what one is;


http://electrical.about.com/od/electricaltools/a/fishtape.htm