6-32 threaded rod works. You need to ream the holes out slightly in the BIE so it fits. Grind a rounded end on a piece of rod and finess it through the cooling fins to the other side. Cut the rod to length required. As an option, you can run some non locking nuts on the rod to create some standoff for the fan and shroud the open area. Or use an old 120mm fan shell as a shroud. I used nylon nuts to retain it so they wouldn't loosen up.
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