M3 front bumper support panels

I recently acquired a new to me "1997 M3" and it is missing the panels behind the M3 bumper, which include the M3 brake ducts, the support trim and a huge portion of the wheel well liner. I am looking at the following diagram and wondering if part 21 contains part 27, or if they are completely separate:



Part 27 consists of a left/right trim support (Part #: 51 71 1 977 117 and 51 71 1 977 118)
Part 21 consists of a left/right spacer (Part #: 51 71 2 250 641 and 51 71 2 250 642)

It looks like part 21 contains part 27, but not sure. Could anyone here confirm this at all? What other internal elements should I be concerned with. I did price out the wheel well liner, these two parts, the left/right M3 brake ducts. I just don't know if I need the left/right sealer (Part #30) or Part #11. The M3 was in a minor fender-bender, but the people rebuilding it didn't do replace the missing parts.

What else would I need? Any help would be appreciated.....

Thanks

Paul