Repair Cockpit Aluminum Trim

I just bought a 1982 Sunfish that is in great shape. But it had been sailed in salt water and was then in storage for many years. The mainsheet hook and aluminum cockpit trim appear to have been touching and both got badly corroded. I was able to clean up the mainsheet hook but the aluminum trim has completely worn away below it and one piece has popped loose from the rivet hole in the fiberglass. The hole in the fiberglass is intact. What would be the best way to go about repairing...

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