For the 2012 Acura RDX, the listed low-beam headlight bulb is D2S, while the high-beam and daytime-running-light applications use 9005. Confirm the existing bulb and housing before ordering, especially when replacing the low-beam system.
Fog-light fitment is listed with two options: H11 LED and H16 LED. Verify which socket is installed on your RDX before selecting a replacement. The front turn signal and parking light use 1157A, while the front and rear side markers use 168NA.
For the rear lighting, the reverse and rear turn signals use 7440. The brake and tail-light applications include 7443R, with additional tail-light listings for 168 and 917. The center stop light uses 921. Interior listings include a DE3175 dome bulb, 2825 or 98 map-light options, and 24 for the vanity light. Compare the original bulb where multiple options are shown.