Go to the parts department at your local dealer and ask if they have any seconds they have taken off another. I have runner boards on mine, but the black end pieces were broke at one end. I went into the parts dep at my local dealer to find a price and details about replacing etc. They gave me the part for free as they said many people are having them replaced and they have a bin full of old runner boards with end pieces etc
I asked about how easy they were to fit and they came out to the car and showed me. Looked easy enough and will let you know when i get it done this wkend