Is there a trim piece for the bed rail behind the cab?

[OregonTrail]

My cover should be here today. I ordered an extang solid fold 2.0. My be has trim on 3 sides but not the top of the rail behind the cab. If there's no trim, how do I best seal that gap? I have the spray in bedliner.

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[Alans17]

Weather stripping. Your cover may come with it. Otherwise, any hardware store will have it.