Hi 16 Bit, I did a little looking on the internet and found a couple of websites for you.
http://www.ozsuperkart.net
http://www.superkart.com.au
Both these sites have email and contact details for people who would know a thing or two to help you. Also I might suggest ebay but am not sure if there will be any on there. Hope this helps. Let us know how you go.