Hi
I have one part look similar to your part marked Siemens, but not marked Bauart :
i think it's radio or part or light from inside cockpit ...(Leuchten)
,
For my,i know sure it's coming from one He111
So, i think we can't identify one Fw with theses parts,
you need found more relics ...
The best ist found one marked R8-190 ....
Bsrg, Dan