This thread just gets more and more ridiculous and confusing. In the pics it seems to suggest that the manual trans rad uses the plate as well? Threading a pipe thread with a tap or die would probably work nicely if the adapter plate doesn't prevent that somehow for the upper hole.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)