Cont.
4. So I didn't get pictures of the sensor removal...
With the black license plate trim removed, you will see both of your sensors. There are TWO retention clips on the black trim that you will spread out to release the sensors. If you lose the black rubber gasket, just put it back on. The flat side goes against the sensor base and the grooved piece faces you.
Replacing the black piece
To put it back together, it is not reversal of steps entirely. Bear with me.
5. Put the sensors making sure the gasket is on the sensor and just tuck them in the cavity where you can get to them.
6. Snap the new black piece back in.
7. Using your hand, reach behind the black trim piece and snap the sensors back into place.
You should hear or feel two clicks but I just press in on the sensor and if it is loose or pops out a bit, I know it wasn't captured on both clips.
8. Install the side trim pieces. Start with the furthest side outwards, first. The inner tabs may need to be bent outwards to be engaged into the slots or the trim piece will jut outwards. If that happens, just yank and start over.
And that should be it!