Yes definitely an AU.
All the T5 gearbox I have is likely from an E series.
This Rare Spares web page says from XC to AU Falcons.
I had thought maybe the early BA's with the T5 could have been the same too, but I don't see that mentioned anywhere.
https://www.rarespares.net.au/raresp...f-el-au-falcon
It seems surprising there is nothing being made already.
Perhaps there is an easy may to knock up a substitute?
I also meant to mention, I was advised to check some Transmission specialists as they may know what the alternative is.