For my 2010 Prius, I used the Toyota branded door edge protector. I won't do it again. Although it was color coded, the aluminum strip fit over the edge of the door and filled the gap between the fron and rear doors nicely - it looked terrible (IMHO).
I also think that it is counterintuitive. Although "I" am careful when opening my doors not to "bang" into the car next to me - this door edge protector doesn't prevent "the other guy" who doesn't care about HIS car to bang his door into the side of my car - causing a dent.
Anyway, I won't install that again.