Let me try and explain what I need. Let's say we place a screw in our trolling motor cover panel on the boat's fiberglass.. They make these plastic "caps" that cover over the screw head and onto a plastic base.This is just a way to "neaten" the look of the panel.

If anyone can translate my question and/or knows the name of a source of these "caps" and "bases" I'd be might grateful to a reply.