1966 Barracuda fender mounted turn signal bulbs

There is a nut on top very thin. I used two pairs of pliers and gripped the bottom section below the flat flange and gripped the nut on top and it twisted right apart. The bulb does not hold itself in, it is sandwiched between the nut on top and the threaded bulb receptacle. And yes it's a 330 but most big box auto parts stores don't have them anymore.