This action for One pair Side Mirrors Assistant Turn Signal Light Indicators For 15-19 Subaru WRX / STI
Now your turn signal lights actually able to shine through which make it more visible to other drivers that may be behind you or in your blind spot area
Let people know when you're wanting to make a turn or getting into the next lane with the OLM Light Tunnel Turn Signal Indicator.
They installed a black piece of plastic where they should have installed a clear piece. This piece allows you to see if your turn signals are on and some people might be able to see it from behind as well.

Product Specification:
New Gazoz Trademark Brand Product
Comes with Clear color

Installation:
Just unscrew your turn signal housings, remove the plastic covers, break off the black plastic piece and install these. Then reinstall everything.
English Instruction includes

Compatible:
Subaru WRX 2015-2020
Subaru STI 2015-2020
Subaru Levorg 2014-2020