MB's post reads she may have 69 calipers (single piston) on the front rather than 67 (four piston). The car could also be a changeover from drum brakes.
A good check is the hard line at the frame where the rubber hose attaches. Disc brakes have the hard line ending on top of the frame rail where drum brakes have the hard line going over the edge and pointing down. If she gets a rubber line for disc brakes, it may be too short in length, having to loop down then come back up to the caliper. Disc brake hose came from the hardline on top of the rail and fastened to the upper control arm, a straight shot, so to speak.
I would recommend getting the braided hose as it would not expand when brakes are applied as in rubber hose, a firmer pedal feel. If braided is gotten, MB can cover the braid with 2:1 shrink tubing to protect the braid and protect hands from scratching.
Just my thoughts, if I'm wrong, educate me. I hope MB has a good present opening at NPD.