It doesn't get much more ordinary than this. But we restore a lot of taillights and this is perfect as a seal for the plate that covers the electrical connectors on the back side of the housings.
It took a while for us to find this ideal solution to one of our restoration challenges. The gaskets on the backing plate on LWB turn signals are either rotted away or gone. This rubber edge trim is the perfect size to replace and keep the wiring area beneath it snug and dry. Sells by the foot with a four foot minimum and two foot increments. You will need about 2' per taillight.
You might find other uses for it as well.