I’m not sure if they ever figured out what was used. If I remember the old research, they also found that the microphone Lando uses to warn the citizens of Cloud City used the same part but not sure if that is true.
Various people have made them from time to time. I have one from someone on the board from about 15 years back. With them being used in Rogue One, others have attempted to make them. You can find versions on Shapeways and Etsy.
Note: I am not claiming accuracy on any of these. I also do not know if and what the differences in details of those used in The Empire Strikes Back and those used in Rogue One.