Top fender mounted turn signal issues

I have a 66 barracuda with the fender mounted turn signals, and the passenger side is out. I'll check the ground, but my question is this. Is the bulb able to be replaced? It looked to me like the amber part under the chrome cover and the bulb was one unit.

Yes - Don't have one in front of me right now; IIRC the bulb holder unscrews from the housing. I like those 66 fender mounted turn signals so I'm adding them to my 65 Dart wagon.