Can anyone confirm the brake line size on my 08 Yukon XL? I need to splice the two lines running from the ABS unit to the rear brakes. I searched this site and found several people saying they were 1/4” but, after laying out the $$ for 1/4” fittings and a 1/4” flaring tool, they are larger than 1/4” and tool and fittings are useless. Are they 7mm?