It fits perfectly in the empty space in the 2019 4Runner. The wiring diagram is a bit strange, but when connected correctly, the "taillights" (lower part) will be on when the position lights are on and off when they are off. The light image (above) lights up when the light is on and goes out when the light is off. There is too much stray light in the taillight, so it's a bit brighter/different than the stock lights on my 4Runner. .
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