Some pictures of the new unit. The installation went well, but the instructions could have been more educational. Cutting the support with a grinder was necessary. Also some of the bolt lengths was not in accordance with the instruction, but it was not a show stopper. In total Iḿ satisfied with the solution.
I could convert an old non FI tank to FI without very much effort and cost. As you can se from the pictures the top flange fits perfectly into the tank curves (4 1/2" diameter cut out needed) I need some more fittings to complete the job. The fuel pump itself is a good brand and should do the job.
The advantage of this solution is that the old level sender is in itś place and work as usual instead of a compromise between a fuel pump armature from a later BMW thatś inserted in the fuel sender position without a sender that is adapted to the depth of the tank.