By subframe, do you mean item 1 in your link, the front axle support? I haven't dropped one myself, perhaps Weasel or Killcrap could comment as BMW techs.
If you can't clean out the threads easily, can you just drill it and put a bolt and nut in?
Item 3 is called a reinforcement plate, but I always called it an underbody tray. It has been posted here that BMW advised not to drive without it in place, but I can't imagine it providing much stiffening, it seems more like an insulation item than a strength item.
Check this article for good photos of the underbody tray on a 4.4
http://www.xoutpost.com/articles/x5/...lvetronic.html
Good luck, sounds like you have some small jobs to do!
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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