A cowl vent cover and a cowl vent repair kit.
I probably should have ordered a vent cover/cap years ago. This part fastens to the cowl air inlet and covers the entire area. The part has a foam rubber gasket that forms a very good seal to keep water/debris out.
The cowl vent repair kit will be used to deal with the leaking cowl vents( or at least it seems like that is where the leaks are...).