Originally Posted by _Stretchie_

People over on the BlackBird site use a 'Buttflap'. I kid you not, not my cup of tea but does exactly what you ask.

http://www.jaws-motorcycles.co.uk/bird1.htm

Just past halfway down, titles 'New for your butt !!!'.

Worst you could do is enquire and get told they only do them for the BlackBird??