They're available. Gonna cost money; see
here (Australia/US dollar exchange works in your favor). That "need body number" thing is because there was a body change in the rear quarter glass area on the Australian Valiant wagons when production of those body parts was shifted from North American import to local Australian manufacture in the middle of AP6 (1965) production. So even though yours is a '66, you need to specify "AP5/early AP6" to get the correct seals for your US/Canada wagon.