I'm building my brake system and I need to know a fitting size. I have a C5 MC and C4 calipers with 6mm lines and M12x1 fittings all around except for one port on the MC. I have the lines teeing off in the front and the back to the individual calipers, but I can't make the lines from the tee to the caliper until I know what size nut to use to screw into the flexible brake lines. I can't find my lines (I've got parts everywhere), so I can't just try it and see what fits. So does anyone know what size I need? I have M12x1 and M10x1 nuts, and the lines are stock C4 brake hoses.