Herrods will do it for you, but last time I checked they wanted you to supply all the parts (which can be tricky to find).
I recently had mine converted in QLD by Mal Wood - who were tops. They should be able to supply parts for you (I'm pretty sure they will be able to) - so I'd give them a call ( www.malwoodauto.com.au
If your feeling especially brave, wreckers will also do a conversion for you if you buy the box from them - but the box condition is a unknown (reasonable chance of being shagged).
Or, if your mechanically able and have time, you could probably do it yourself ( there is an article on doing eb/ed's in the fordtech section . . .