Mk2 Escort Estate - rear seat belts?

Hi there, just joined from the UK as I've been told that my best bet to sort my seatbelt problem would be Australia! I have a white mk2 Estate which I want to fit rear belts to for my daughter, but there's nowhere to mount the top pivot. I've been reliably told that Australian-spec estates had rear belts fitted, and they used a bar that bolts up behind the seat and mounts the top pivot halfway up the side window. Has anyone here got an estate with belts, or have the parts to fit them? Any help is really appreciated.
 
Cheers,
 
Anth.