That is a tricky question and the answer is yes/no.
We had swivel seats a long time ago and previous management got rid of them. We decided to make them standard again and the supplier decided they did not want to build them any more. So we used up what we had (only about 20 sets).
What you're seeing is the Atwood pedestal for the E450 chassis that was designed while I was at Suneeker/Forester. It slides out at a 45 degree angle, and then pivots making it much easier to swivel the seats. I do have Atwood working on a set for the M2. We have installed a proto-type, but we'll need to wait for testing results before we can offer them. Once all that is done, I see no reason they couldn't be an aftermarket install.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).