It " looks " like the Utopia. Could be the a copy cat version. The Utopia is about $20.00 less at WingStuff. Other brands could be just as good, but for non-bar type backrest I have never seen any other brand advertised or suggested on Wing Forums until you brought this one up from Add On. The picture below is an old picture of the Utopia from WingStuff. This one we know how to attach.Add On inc.
Is this a quality seat backrest?
Parts # 18673-816K