Woodcraft from the USA make some very nice components and their clipons are amongst the finest.
All woodcraft clipons feature a two peice mounting collar so removal of the bikes top clamp is not required and even clamping pressure around the very thin fork tubes found on late model sport bikes can be assured to avoid any stiction.
There is a huge range of different riser type bars from 25 to 75mm in many different fork diameters. Just ask us.