New inner shaft is not made. Although the option of custom exists $$$ and a month to make.
Search for used is not going well in the short run. I expect in the longer run one will turn up. I have a wanted post on IFSJA and have been making calls - waiting to hear back.
There is a junkyard in NC with about 100 FSJs - but he's closing down and not in good enough heatlh to be pulling parts. Pull your own only.
Sealing surface is very good. One reason I'd like to save it.