Ok my truck has the wiring for a amp in already in there. I don't currently have an amp and want to use the wires to hook up my CB too. Well I need a fuse for the fuse holder. It is street Wires wiring it appears to take an AGU fuse whatever that is. Where can I get these? Are there differnt sizes or aslong as I get the correct amperage should I be ok? If differnt sized AGU fuses how do I find out which size this takes?