Question: What is that plastic part inside the grill? Is this part of the driver or does that just protect the driver?
The drive itself is translucent white (off white really, but a light color). It is flat and made of some kind of membrane, again not sure if it is plastic. Not sure if I'm remembering correctly, but I believe the outer edges of the driver are rectangular in shape, but I believe the active portion is oval or round. This membrane attaches to the ridgid black housing described above.
Do enough searching in archives and you will find pictures of an open ear piece.