Pelican pics did show up on a search. I didn't blow up that pic for a big view. I'm more convinced the cooler is not seated correctly. I think the plastic pinnacle is stopping it short. A picture showing the pinnacle was not found. Your picture shows the pinnacle right under the yellow arrow.

A new mounting plate arrives tomorrow. It will be a back up plan. The coolant will be drained. I'll go "hog on it". The OEM upper hose was almost hot tied to pull off. I couldn't get it off the coolant tank. It took 15 minutes or more since it was on so tight. I felt it was going to break off. A new tank will go on too. The "check coolant level" notice is annoying.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)