does anyone know which port on the master cylinder is front and which is rear on the JB7 brake system? Is it the large line (0.25", rear supply) in the front or rear port as the cylinder sits in the vehicle? The lines seem to changed from the way they were... and inspection of other trucks around here has yielded more questions than answers. (1 each way...) this was a 85 C10 with plastic reserviors and is now a 85 C20... the lines seem to have switched front to rear from the previous cylinder? can that be right?