If you're doing a manual transmission conversion (either from automatic, or upgrading to a better transmission), especially when using our adapter parts, you'll need the clutch hose to connect the master cylinder to the slave cylinder.
We offer these -4 hoses in various lengths to suit. Typically, 3 feet is enough for car chassis' (LS, GS, Mk3 Supra, 240SX, etc.), though the truck guys often opt for the 4 foot version instead.