Do you mean the little black strip that goes above the bumper at the corners? I don't believe these are available, but they don't look hard to make.
I am not familiar with anything in the middle of the bumper. I know I put a led strip designed for the back of trucks in this location on my 65 valiant. When it is off all you can see is a silver/gray tube that blends in perfectly. When you have running lights on it lights up and it increases intensity to function as a turn/brake light for each corresponding side. It is one of my favorite things I did to the car. With the blinkers on you can really see the speed difference between led and incandescent.