A few months ago, I tried to find a HotSpot kit. Graupner does not make them anymore.
I contacted a lot of dealers in the US and Europe and found nobody had them.
The only place I am aware of to get one is from
Peter Liebetrau at
http://www.jet-team-liebetrau.de/index2.php.
He is the original HotSpot maunfacture. I talked to him and he has a new wing design for the HS which is now part of his kits. The price is very good...the problem is the shipping costs are astronomical.