Lookink for a Brazilina bus steering box

Hej Hej, 
I have a big problem with my steering box. The thread from the side cover, that adjusts the strenth of the steering, is busted. One option is to mak ea new one with w helicoil.
The other is to get a new cover, or a new box altogether.
By any chance anyone has or know  who has one of this brazilian steering boxes? or parts that fit?The come complete with the rod all the way to the steering wheel.

Here some photos:

The box:

The side cover:

Here you can see the part number of the box:

Tack Tack!