boudreaux thank you for the response and the sugggestion. I will make it "plan C",
"A" being the FSA 39t I found on the Harris Cyclery page, however it does not seem to be available in Australia.
"B" is to use the TA 39t (10 speed) I got from them last week.
"A" + postage is far greater $$ than "B", so "C" may end up being the most practical option.