I took one of the broken slugs and webbing off the sail, and took it apart. Then, I bought slugs and 1/2" webbing from Sailrite - enough for the whole sail (30 feet, as I recall). Meanwhile, I used 1/8 line to triple tie a new slug onto the sail, so I could keep sailing. This actually is working out pretty good.
At home, I assembled and sewed 14 or 15 new slug/webbing sub-assemblies on my Calenda beastie of a sewing machine (Actually same as Pfaff 130). I will then hand sew (with a sail palm) these on the sail with a sail palm during our vacation cruise in August. Not the easiest, but the hand sewing is pretty much the only way to do the last step.