Oh mate! I went through all the archives and all the toyota books and manuals from all over the world to find that shifter housing. In the end I bought one from Japan brand new from toyota as spare parts because toyota here would only provide an entire gearbox or nothing.
There are other parts you also need to make it work, but I can't remember all the details as it was years ago. I "recon" I might still have the part numbers of what I bought if I can dig out the email.
One better actually, I've not had a chance to actually. Put it all in the w57 and it's still all in the box sent from Japan if you want pictures and more detail.
But, if you're keen on finding the part from a wrecker in aussieland, look for a 2wd petrol Hilux (I think their nick-named lo-lux) made in the nineties and early 2000's. The diesels and 4wd, had different gearboxes. I could only definaty pin point those shifter housings from the American model Tacoma's.
I hope this helps.