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I would shape some styrofoam inserts to fit into that space.
Expanding foam in my experience is just that... expanding foam.... and it keeps expanding for about one month.... especially when the sunlight heats it up.
Styrofoam on the other hand does not expand any appreciable amount and can be sealed by various means.
If you use a water based glue to hold it in, make sure water can not get in there.
Jim.
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