Shit Luke, that's a pain in the arse! Have you had a look to see if it looks like it's really been eaten by a rat - it seems very unusual

The first thing to look at would be where the loom is damaged, and how badly - if it's only one or two wires you may be able to solder them, seal them with heatshrink and be done with it. I suppose if you do need a new loom I'd try
http://www.findapart.com.au (some people have had success, I never have) or start at your local wrecker.
Welcome to KSRC and good luck with the bike. FWIW, when they are going they're a hoot to ride
