None have turned up in Australia as far as I can tell. Some other US spec mufflers, mostly V&H for Classics, have now been discontinued. Looks like anything with a removable bafffle might be at risk. As for the Arrows, they’re still showing in the parts file, including the US spec, and is still in the configuration here (although the Euro spec has gone), so you never know. I’d be hopeful but resist being too optimistic.