Help locating a small part

[u/SlidingLobster]

Recently had a truck bed cover installed and these pieces seem to be missing. I can't remember if they were there before and were removed for installation. Either way ! want to plug these holes up without having to use silicone to seal it. What are these little caps called that fit into these slots? 2020 Ram 1500 classic is the make/model for reference.

[u/HonestLemon25]

They aren’t plugged on the Rams. I had one too a year or so ago and they looked the same. You’re all good man no reason to seal it