a long shot, try A R Maxwell (03) 5883 1315
http://www.maxwellmotorcycles.com.au/
i was a little surprised the guys at Teknik know him, being almost at opposite ends of the state.
anyway he has 1/2 an acre of bikes or more. and being a rural area he has bikes of all kinds and shapes and sizes.
my old man used to tell us about the TC 120 Wildcat he bought brand spankin in 72.
there was an option of 90 or 120cc, so he went the big bore 😆 😆 😆
maybe also try Rochester Motor Cycle Centre (03) 5484 2166
they used to wreck a few bike years ago. but i don’t know to what extent since the sons have taken over.
and i tried to find a listing for Mr Motorcross, used to be in Melb. area. there was a period of time he was in Bendigo, but can’t find any current info for him/them.