I think you're right, Crawford. The original part no. for the chainguard was 44610191A but a check on the Stein Dinse site shows that part as no longer available and replaced by 44610192A. The picture from Stein Dinse certainly appears to show a longer tailpiece for the new one (top = old, bottom = new).
If you can't live with the look, there are still old versions out there, both new and second hand.
https://www.ebay.co.uk/sch/i.html?_f...cati+44610191A
Or, you could cut the tailpiece off and replace it with a carbon version
http://www.ukmonster.co.uk/monster/s...t=57863&page=7 (it's meant to be stuck over the original but I don't see why it can't be mounted on its own.