One of my wires broke...is anyone familiar with fixing them or know where to find replacements?

Thanks!

 

This system has been available on many GM cars and has been known by different names-the one I remember is "Vigilight". (Believe it or not, I oncehad a '69 Camaro with this option). Cadillacs had these quite often-just go to a junkyard & cut out a piece the length you need. These are much brighter if the ends are cut cleanly-sometimes i've seen guys heat the end of the cable with a lighter until it just starts to melt a bit, & forms a nice smooth "bulb" at the end. Easy does it, though, don't blacken it or melt it to the point it's no longer smooth.