New fusible links are available at any auto parts store in a variety of gages; you are looking for #14 gage. I would not bother with used links, keep in mind that links have a designed length required to dissipate heat for momentary overloads before opening circuit, special inflammable insulation that only melts, and will open circuit during a dead short.
You were real lucky the fire gods failed in their attempt to burn down your car; go buy a power ball ticket while you’re hot. LOL
Chrysler ignition has two independent circuits that interact to start & run engine: first is a start circuit that bypasses ballast resistor to feed coil with 12 volts when key is in start position only; second is run or ON circuit that takes over supplying energy to coil at reduced voltage at around 6-7 volts via ballast resistor once engine starts to keep from burning up coil.
Side note: This is the reason when ballast resistor fails engine will run as long as key is in start position, and stop when key returns to run or ON position.
Shorting starter relay with screwdriver will turn over engine no matter what position ignition key is in as long as battery, relay, and starter are connected.
You need to trace out the ignition circuits, and others following a wiring diagram to be sure that other wires were not melted & shorted out.
