Hi
I haven't seen them lit or in any car, so it's a bit of an unknown. I did not notice that they had a blue bar ground. On close inspection the bluefish bit I think you are referring to in the picture on the original link looks like a metal mounting bar inside the lamp.
If you look at these
Other lights they look blue because of a transparent watermark that's blueish. That may be exaggerating the blue look on the metal bar on the originals in my first post
