I'm doing a full 4 corner brake upgrade to X-drilled rotors, street pads, brake duct kit, and braided brake lines. My braided brake line kit came with 6 lines, I know the 2 smaller ones are for the rear and the 2 larger for up front of course, but the kit comes with an extra small and extra large, where do these lines go? Or are they just extra in case one leaks? Also for the duct kit