Vented & Non-Vented Tapered Plugs
The flange on these plugs can be used to mask the leading thread chamfer or mask of surrounding grounding surface. The flexible material allows for a snug fit.
These will also cost less than standard tapered plugs due to less material.
The vented versions have a small slit designed to allow pressure to release when it builds up, yet keep moisture and paint out.
The drawback of these two plugs is that they can be more difficult to remove.