I was thinking it was the bracket that cracked...and I trusted your assessment that ET was fine...but you could always pressure test it with a wet/dry vac blowing or something...just figure out a way to seal up the outlets. You have ET and bracket, so you should be good.
If I find out you've been contaminating the bmw system and using anything but distilled water from an ACEA A5/B8 certified source, you do not want to be in a thread with me again. I'll remember and will never forgive you. Neither will Mango or Gheybe.