H165 and H190 centre section/diff head are not rare in USA, maybe $95 price, and much cheaper if going to certain wrecking yards. Shipping to AUS will double the price.

H190 4.11 is very common as is 3.90, even other ratios.
H165 4.11 is not common, but 3.7 and 3.9 are. 3.3 and 3.5 can also be found.

This is just to help those looking for parts -- Was searching and found this -- this chap has according him h160 + H190 centre piece so a 410 and 390. If i'm correct this is USA. Site to look dwarf car racing forum -- under dwarf car racing parts.For those looking for carbs saw a set of keihin carbs 41mm.Plse re-check if you interested and don't shoot the messenger.I was looking for a motor complete with gauges when i found this --would like turbo motor but have to see what the financial dir says.OH carb price $400