ST90 Honda 90 1973

I own a honda ST90 green machiene 1973 model, in desperate need of chain and sprockets, front and rear as the present set is worn excessively. Im in the searxh of some engineering workshop or genius that is able to make them or supply me such. I am ready to negotiate with someone who could perhaps assist, can somone help me please? Peter Sokolowskyj sokoblast@unwired.com.au

psst nothing is written reguarding registration, its says only to ask the question so I have no idea how you work and your lack of information tells me little so the rest is trial and error.