Fettpride, Bobamaker and Asok are casts of an ILM (preproduction) Jango helmet, which means to be practically the same as the Screen Used helmet except for some details. Asok had to do a new mould because the one he bought was really bad, also fettpride has made a new mould for his helmets because he modified some things like the visor zone (not the mandibles, just the visor) for making it smooth, a reworked ear and also I THINK he has attached the keyholes piece to the helmet, but I'm not sure about this, I haven't studied this.
BTW, all three helmets ears are part of the cast, not a separated piece except for the ragefinder ear.