With a little help from a "JustAnswer" mechanic I was ble to determine that the duct piece had expanded from heat over the years. I then wrapped the edges of it with duct tape,which enabled it to fit snuggly in place.

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2003 X5 3.0 - 200K
2019 Subaru Forester - 80K
1986 Merkur XR4TI Intercooled - 160K