Here, you are looking at the OLM Upper Tail Light Trim Piece For Aftermarket Lights. These pieces are included with your stock tail lights and can be transferred over to any aftermarket lamp. However, in 2017 and 2018 models this piece is integrated into the newer taillight design. With that said, if you get aftermarket tail lamps for your 2017+ model, then these will come in handy.
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