G'day Kenny,
There are a few of us on here from Oz (Phreak97 and GSXR126 are some of the most active).
The Niki is indeed a FIAT 126p. Most parts are readily obtainable over the net (and usually quite cheap), even though they seem next to impossible to get when you try locally.
This forum will help a great deal, lots of knowledge by those that belong to it and by becoming a subscriber, will also give you access to electronic versions of workshop manuals which you may want to consider.
Aaron