What does the white wire clip to?

The fusible wire should be gauged to protect the wiring not the components added. So that it blows before damaging the wire harness. I would just replace with factory type.

I'm sure there are other resources to get them maybe locally and cheaper, dealer? Napa? Make one? not sure of the gauge off top of my head though 14ga rings a bell.
http://www.classicindustries.com/product/mopar/parts/ma4200.html