I know this thread has been around for quite a while, but I thought I'd share my recent experience with a vent window replacement on a 380DA. It may or may not be the identical dimensions as other 'dancers, but the design is at least very similar.
After searching for quite a while, I came to the conclusion that Ocean Dynamics (305-770-1800) was possibly the only company willing to fabricate this. No one else that I found would do curved, tempered glass, the Taylor Made replacement is no longer available from them, and I found nothing helpful on eBay, Google, etc.
However, OD was able to source the matching, green-tinted tempered glass, and had a pattern for a similar year 380DA which seemed to match mine almost perfectly. (I did ask them to increase the curvature very slightly from their drawing, which they accommodated perfectly.)
I'm not gonna lie... this was a very expensive project. But, given the various other options seemed like value-lowering hacks, I bit the bullet.
The entire team at Ocean Dynamics was awesome to work with. They responded to my initial email inquiry within hours, provided a quotation within a day or so, communicated quickly and clearly throughout the process, and delivered the replacement glass in less time than they quoted (just over 3 weeks). It was packed and shipped in a very robust box and arrived in great condition.
There was one very minor issue with the glass - I needed to make a trivial adjustment to the mounting brackets - but their team responded via email and phone within minutes to discuss and propose a solution. I installed it yesterday with absolutely no issues, and their Operations Manager personally called me last night to follow up and ensure I was pleased with the results.
Cost aside (I appreciate this was a fairly complicated "one off," custom project), I am extremely pleased with these guys and the product they delivered.
I was not asked or compensated in any manner to make this post; I was simply very pleased with these folks, and know how difficult this project has been for other DA owners.