What Garyhjd said is accurate re the vendor not selling his cowl in the U.S.
As far as I recall, previous threads about it did not expound on the rationale for not exporting to the U.S. They mainly focused on it's appearance and if the seat is different or modified.
The mfgr web site is
http://www.hs-1.de/
I'm just guessing that it is functional since it appears to have a lock set. The pictures of his other products make me believe that his products are excellent design and quality.
A careful reading of the forum will show pictures from at least one European member's pics of it on his bike. AimoPaukku's pics might be a good place to start.
When pics of it initially appeared in this forum, many stated they were going to contact the vendor.
I actually did, and this was the response:
We are very sorry but at the moment we do not deliver in US because of product liability / insurance reasons.