firstly, the kindest thing to do would be to get the female desexed before you rehome her. otherwise you run the risk of someone using her as a breeding machine.
i agree that contacting a specific husky rescue organisation is the best thing to do because they know the most about the breed and can match them well with their future family.
don't put your dogs on gumtree, there have been lots of recent incidents of people advertising their dogs on gumtree (particularly free to good home ones) where they are snapped up by illegal dog fighting rings who use the dogs as bait dogs. very horrific.
another person you could contact would be trish at pets haven in woodend (if you are anywhere near that side of melbourne)