Update on my parts search: I have an air filter, hose, scoop, and o-rings on the way to me. I also realized I would need the U-boot connector hose that goes to the turbo and its 2 seals. (previous owner put on a differently shaped connector with no seals).

The connector hose and upper seal are widely available but I'm having a hard time finding the lower seal anywhere.

That would be this one: 617-098-03-65
https://mbparts.mbusa.com/oem-parts/mercedes-benz-seal-ring-air-filter-vlrb-6170980365

Any leads on it?

EDIT: For anyone else reading this in the future with the same dilemma as me, I believe I found a replacement. This seller is making silicone replacement seals and selling them at $40 a pop.
https://www.ebay.com/itm/325333917236