All auto parts stores carry fusible link wire. It's sold in rolls by gauge. You need to match the gauge and length that is on your truck. Factory ones are wired up like a house. Every connection should be done inside a box in case of fire the box will run out of oxygen and the fire should go out. So if you look at your factory fusible links the connections are housed inside a plastic housing. Cut them off after the housing and solder in your new fusible link. Capping them is a good idea. Another option you have is to make a convenience center on the firewall. Route your cables there and use mounted Maxi fuses. A donor fuse panel could be a cheap way of doing it but the easiest way is to just replace the fusible link.
*here are some already made up links
http://www.sherco-auto.com/electacc.htm
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