Gidday Craig, good to here another Z owner here in oz (I'm over in Perth W.A.)
I know your grief about finding parts
.
I have found and bought quite a few items from Ebay mainly in U.S.A. (just have to check the shipping costs first though)
Type in Yamaha tri z also try Yamaha ytz 250 and tick the box marked Search title and description, it gives more results. Also try in Ebay Motors with the same search criteria.
I have got a couple of parts from Inskip Yamaha in N.S.W and they posted in a week.
Good luck with it all.
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My Rides-
1985 Yamaha YTZ 250 Tri Z
another 1985 Yamaha YTZ 250 Tri Z
1985 Honda ATC 200 ES Super Red
1975 Bultaco Pursang 250 ( Hey I know it's only got two wheels)
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It's not an optical illusion, it just looks like it.