I did get a reply:
Unfortunately, the 3.23's have been discontinued for years. At this time, I do not know of anyone who is planning on bringing them back into production. The problem is, in order to make it cost effective, gear sets need to be done in runs of 200 or more.
Wish I had better news
I suspect they could sell 200 of these and if you want a set, jump on board and maybe we can make it happen.