Someone casts these up, I'm in for a set.
It's impossible to determine from the photos we have available to us. In the movie version pic you posted, the interior seems to have a reddish tint. Although the pic in the Star Wars Visual Dictionary definately has some detail such as buttons added.And does anyone else think that there might be some other details were added inside the cylinder holder? Some electrical greeblies or wires or something?
Your picture looks a bit clearer and it does look like something inside of it.
Is it just me but in your photo does it look like there is something hanging down under it that has been cut at an angle.
Could this possibly be some type of rope and there is a small knot or something hanging down. My thinking is the rope/wire/cable is attached with a knot through the hole were the piece on the bulb holder has been cut off the original. The rope then feeds through the bulb holder then through the flexible grey pipe.
Just an idea.
I have the TE ones and he did refer to them as paint stirrers, but I don't think he ever swore that's what they were.The TE ones are a nice approximation but lack some detail.
Possibly considering their eye lense is falling off or maybe only one of the two drivers had them.Meybe it fell off before/during filming? Its there in publicity photos.