I turned an adapter ring between the large Yaris tube and the smaller Pantera tube. I cut the Yaris tube and the Capri tube to the correct length and then TIG welded the ring to the end of the Pantera tube:
I then welded it to the Yaris tube.
I then cut the Capri and Yaris shafts so that the shaft came out of the tube the same length as the Pantera shaft. I turned a sleeve and welded it to the Capri shaft
and secured it to the Yaris shaft with two crossed split spring pins.
Here is the assembled assembly:
I finished the bracket that I had made quickly and fixed it with a spot of weld, all that remains is to apply a black anti-rust paint.
The assembly is perfectly fixed under the dashboard but I need to add an additional bracket to support the torque that would otherwise only be absorbed by the press fitting of the big steel tube of the Yaris on the aluminum housing. I looked and it should be quite easy to do.
I also found a place to easily fix the ECU without it being seen.
To be continued........