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Hi, I am Mike, welcome. I'm reviewing your question.
Here is what I found, at the bottom of this page,
And here is a diagram, http://parts.miniofkennesaw.com/showAssembly.aspx?ukey_assembly=264675
One second on the heat exchanger gaskets
The only thing I have for that is a picture showing the heat exchanger locate in the center of dash
Actually I don't know what you meant by heat exchanger. I assume the repair manual didn't either.