Do the AU doors bolt straight onto BAs?
Heard they do, just want to confirm as im having trouble finding a BA door.

yes

yes

Yes they do but you may have problems with the Wiring harness grommet. Some BA's have a larger opening in the door and Ford supplied a fill in plate. Also, depending on the door you get, AU1's have a different door rubber to BA's. The door bailey channels on AU1's are also different to AU2,3 and BA.