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The fitting for the back of the caliper is 1⁄8-inch pipe to 3⁄8-24 inverted flair adapter you can buy from Wilwood. They recommend 3⁄16 hard line for the job with as little flex line in the system as possible to avoid spongy pedal feel. The flex lines came in a kit from Chassisworks along with a coil of hard line and enough fittings for both axles. It did not include the flex line needed from the axle to the frame.