According Air Services Australia at YBBN Stands 39 and 40 can both handle 747-400 sized aircraft, stands 41/44/46/49 in addition to common user stand 38 can handle 767-300 sized aircraft. I'm not quite sure how easy/hard it is to play around with the stands to make them sized accordingly but from what I can see Qantas 737-800's quite happily fit into "737-400" stands and I have personally disembarked from a A330-300 at stand 20 which listed as 737-400 sized.
http://www.airservicesaustralia.com/...BNAP02-125.pdf