Like this one http://www.ebay.com.au/itm/CARBURETOR-FOR-HONDA-GV400-GV-400-ENGINE-CARBURETTOR-CARBY-/331985900563?hash=item4d4be6d413:g:oKoAAOSw5cNYQMA3
The advantage with that one is it is a fully refurbished unit. You might get a second hand one cheaper then find it is gummed up and useless and needing an overhaul.