don't currently have a z500, but have had one in the past - they are a great little bike, with a good 4-1 they sound almost as good as a z900!
Had a few issues sorting out the carbies because this little jigger just did not like running on with pod filters......but it went like a dog shot in the arse when you were on it........
Can't find a pic at the moment but will bung one up when I do.
These models are getting harder to find, ebay is your best bet or seeing as you are up in Qld - get in touch with the local Z Owners club. They might have some leads on any local examples available - talk to Mick Du Hamel, top bloke knows his Zeds, tell him Gos sent ya