Thanks for your reply. The Zooka will come on my SkyExpension (rig like Herbold rode in DH events). It is a purple one and it will look great on it. Currently there is a ControlTech stem in place. Nice stem, but it just doesn't look right.
I currently use 2 Zookas with shim. On my Verlicchi and my Yo. In particular my Verlicchi has seen quite a lot abuse with the setup. In contrary to in the beginning, after some retightening the stem now sits without any hassle for several 1000s now. Actually I feel save, but at the same time it is still not a setup I would recommend to anyone.
On both stems I have the split is at the back. I did that because I reasoned the wedge clamp would press the aluminium in the split if I decided for split front.
I found this on the HiBike site => http://www3.hibike.de/main.php?sessionI ... groupID=31
I think it is a 1-1/4" to 1" reducer, but I am not completely sure on it. A pic is missing, what also doesn't help much. I contacted the people, but so far no reply.