I don't know if you got any reply to your situation or not. This same thing recently happened to me. The IMRC unit has 2 metal arms. The larger, "S" shaped one attaches to the rear bank (closest to the firewall) while the shorter, straighter one attaches to the front bank. The little plastic washers that allow the round end of the control rod to fit into the square shaped hole are the culprit. They can be bought on line for about 5 bucks each. At my ford dealer here in Canada they are $14.19 each!! If you need a picture of how they attach PM me and I'll get you a picture.
Piper