Don't hold you breath waiting for an answer.
No replies from Mr HDB since January to several questions in this thread and his other thread.
I really wanted a set and was prepared to make em fit myself, even if it involved some engineering. I tried direct email and initially got a promise of action but I gave up waiting after several subsequent attempts over several weeks with silence being the deafening reply.
So I bought a set of Bark Busters.
Don't just look at it - Ride the bloody thing!