I've replaced my fusible link wires with the never boxed fusible links. I just followed the color coding as jono mentioned earlier and ended up with this kind of setup:
(Note it's not my picture but I have the same setup):
So it's 80A for the black wire, 50A for the red wire and 40A to the green wires. These fuses just pop in to the
place of original ones so they are probably the easiest ones to put in place of the original wires.