narcotitlan
Rocky Mountain Fan
Ta!It's a modern ebay special, cost under £20 new, probably Chinese made although it looks and feels more than up to the task.
Sorry but I can't find the link.
Edit - I found a link to someone selling the same stem, although US and slightly more expensive, without shipping it's still pretty reasonable.
https://www.ebay.co.uk/itm/224750443076?hash=item34542b9a44:g:RmQAAOSwpcljyBLK
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