Again it was an assumption that the factory would have used the same hard lines for either disk or drum to save money and the combo valve / distro block would have the same mounting and inlet / outlet locations would be the same.
For the OP, going from a 10" drum brake system to a K-H front, with the nominal 10 x 1.75 rear drum, changin to a combo valve very well may avoid having to change or modify the hydraulic hard lines.
