They take the same size fittings as the originals, which came on the car. Don't take my word as gospel on that, because for mockup way back when, I pulled a junker one and snagged the lines as well from the donor van at the jyard. So using the fittings I made all new lines. The forward one uses a 9/16 wrench, and the rear uses a 5/8 wrench to remove the fittings for the brake lines from the master cylinder.